Aldehydes, Ketones and Carboxylic Acids · Chemistry · JEE Main

$$ \text { Consider the following reaction. } $$

$$ \text { The major product }(\mathrm{P}) \text { formed is : } $$

' $x$ ' is the product which is obtained by the hydrolysis of prop-1-yne in the presence of mercuric sulphate under dilute acidic medium at 333 K . ' $y$ ' is the product which is obtained by the reaction of ethane nitrile with methyl magnesium bromide in dry ether followed by hydrolysis. IUPAC name of product obtained from ' $x^{\prime}$ and ' $y$ ' in the presence of barium hydroxide followed by heating is :

An optically active alkyl bromide $\mathrm{C}_4 \mathrm{H}_9 \mathrm{Br}$, reacts with ethanolic KOH to form major compound $[\mathrm{A}]$ which reacts with bromine to give compound $[\mathrm{B}]$. Compound $[\mathrm{B}]$ reacts with ethanolic KOH and sodamide to give compound [C]. One molecule of water adds to compound [C] on warming with mercuric sulphate and dilute sulphuric acid at 333 K to form compound [D]. The functional group in compound D will be confirmed by :

Given below are two statements :

Statement I : 2, 6-diethylcyclohexanone and 6-methyl-2-n-propylcyclohexanone are metamers.

Statement II : 2, 2, 6, 6 - tetramethylcyclohexanone exhibits keto-enol tautomerism.

In the light of the above statements, choose the correct answer from the options given below

$$ \text { Complete the following reaction sequence and give the name of major product ' } \mathrm{P} \text { '. } $$

Given below are two statements:

Statement I: The condensation reaction between $\mathrm{CH_3-CH=O}$ and
under optimum pH will produce

Statement II: The molecule, will generate $\mathrm{Ph-CH=O}$ in the presence of dilute acid.

In the light of the above statements, choose the correct answer from the options given below:

Compound $(\mathrm{X})$ is subjected to the sequence of reactions as shown above. Molar mass of the major product $(\mathrm{Y})$ formed is $\_\_\_\_$ $\mathrm{g} \mathrm{mol}^{-1}$.

(Given molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{C}: 12, \mathrm{H}: 1, \mathrm{O}: 16$ )

An organic compound “x” where molar ratio of C, O and H are equal, on treatment with 50% KOH under reflux followed by acidification produced “y”. The most likely structure of “y” is:

[Molar mass of ‘x’ is 58 g mol⁻¹]

A molecule (X) with following structure under mild acidic condition is hydrolysed to produce (Y) and (Z). Identify the correct statements about (Y) and (Z).

A. Both (Y) and (Z) have same molar mass.

B. (Y) and (Z) can be distinguished from each other by NaHCO$_3$.

C. (Y) and (Z) react with HCN with same rates.

D. (Y) and (Z) undergo addition reaction with 2,4-DNP.

Choose the correct answer from the options given below :

Identify compounds A and E in the following reaction sequence.

The correct order of acidic strength of the major products formed in the given reactions, is :

A. $\mathrm{PhNH}_2 \xrightarrow[\substack{\text { (2) } \mathrm{CuCN}^2 \\ \text { (3) } \mathrm{H}_3 \mathrm{O}^{+} / \Delta}]{\text { (1) } \mathrm{NaNO}_2+\mathrm{HCl}\left(<5^{\circ} \mathrm{C}\right)}[\mathrm{A}]$

B. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CHO} \xrightarrow[ \Delta]{\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right]^{+}, \mathrm{OH}^{-}}[\mathrm{B}]$

C. $\mathrm{CH}_4+\mathrm{O}_2 \xrightarrow[\text { (ii) } \mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7 / \mathrm{H}^{+}]{\text {(i) } \mathrm{Mo}_2 \mathrm{O}_3}[\mathrm{C}]$

D. $\mathrm{PhCH}_2 \mathrm{MgBr}+\mathrm{CO}_2 \xrightarrow[\mathrm{H}_3 \mathrm{O}^{+}]{\text {Dry ether }}[\mathrm{D}]$

Choose the correct answer from the options given below :

$$ \text { Given below are two statements for the following reaction sequence. } $$

Statement I : Compound ' $Z$ ' will give yellow precipitate with NaOI .

Statement II : Compound ' Q ' has two different types of ' H ' atoms (aromatic : aliphatic) in the ratio $1: 3$.

In the light of the above statements, choose the correct answer from the options given below :

$$ \text { Given below are the four isomeric compounds }(\mathrm{P}, \mathrm{Q}, \mathrm{R}, \mathrm{~S}) $$

Identify correct statements from below.

A. $\mathrm{Q}, \mathrm{R}$ and S will give precipitate with 2, 4-DNP.

B. $P$ and $Q$ will give positive Bayer's test.

C. Q and R will give sooty flame.

D. R and S will give yellow precipitate with $\mathrm{I}_2 / \mathrm{NaOH}$.

E. Q alone will deposit silver with Tollen's reagent

Choose the correct option.

The unsaturated ether on acidic hydrolysis produces carbonyl compounds as shown below :-

Based on this, predict the solution/reagent that will help to distinguish "P" and "Q" obtained in the following reaction :-

Given below are two statements :

Statement I : Cross aldol condensation between two different aldehydes will always produce four different products.

Statement II : When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH , it forms a condensation product with acetophenone only.

In the light of the above statements, choose the correct answer from the options given below

$$ \text { Consider the following two reactions } \mathrm{A} \text { and } \mathrm{B} \text {. } $$

Numerical value of [molar mass of $x+$ molar mass of $y$ ] is $\_\_\_\_$

A student is given one compound among the following compounds that gives positive test with Tollen's reagent.

The compound is :

Which of the following statements are TRUE about Haloform reaction?

A. Sodium hypochlorite reacts with KI to give KOI .

B. KOI is a reducing agent.

D. Isopropyl alcohol will not give iodoform test.

E. Methanoic acid will give positive iodoform test.

Choose the correct answer from the options given below :

$$ \text { Identify (P) } $$

Iodoform test can differentiate between

A. Methanol and Ethanol

B. $\mathrm{CH}_3 \mathrm{COOH}$ and $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH}$

C. Cyclohexene and cyclohexanone

D. Diethyl ether and Pentan-3-one

E. Anisole and acetone

Choose the correct answer from the options given below :

' $x$ ' is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. ' $y$ ' is the product which is obtained from the but-2-ene by the ozonolysis followed by hydrolysis. From the following, which product is not obtained when one mole of ' $x$ ' and one mole of ' $y$ ' react with each other in the presence of alkali followed by heating?

From the given following (A to D) cyclic structures, those which will not react with Tollen's reagent are:

The correct sequence of reagents for the above conversion of X to Y is :

$$ \text { Compound ' } \mathrm{P} \text { ' undergoes the following sequence of reactions : } $$

$$ ' \mathrm{P}^{\prime} \text { is : } $$

The compound $\mathrm{A}, \mathrm{C}_8 \mathrm{H}_8 \mathrm{O}_2$ reacts with acetophenone to form a single product via cross-Aldol condensation. The compound A on reaction with conc. NaOH forms a substituted benzyl alcohol as one of the two products. The compound A is :

$$ \text { Match the LIST-I with LIST-II } $$

<mrow data-mjx-texclass="ORD">

  <mi data-mjx-auto-op="false">NH</mi>

</mrow>

<mn>2</mn>

<mrow data-mjx-texclass="ORD">

  <mi data-mjx-auto-op="false">NH</mi>

</mrow>

<mn>2</mn>

<mi data-mjx-auto-op="false">KOH</mi>

<mrow data-mjx-texclass="ORD">

  <mi data-mjx-auto-op="false">NH</mi>

</mrow>

<mn>2</mn>

<mrow data-mjx-texclass="ORD">

  <mi data-mjx-auto-op="false">NH</mi>

</mrow>

<mn>2</mn>

<mi data-mjx-auto-op="false">KOH</mi>

<mi data-mjx-auto-op="false">Ag</mi>

<mrow data-mjx-texclass="INNER">

  <mo data-mjx-texclass="OPEN">(</mo>

  <msub>

    <mrow data-mjx-texclass="ORD">

      <mi data-mjx-auto-op="false">NH</mi>

    </mrow>

    <mn>3</mn>

  </msub>

  <mo data-mjx-texclass="CLOSE">)</mo>

</mrow>

<mn>2</mn>

<mi data-mjx-auto-op="false">OH</mi>

<mi data-mjx-auto-op="false">Ag</mi>

<mfenced open="(" branch_open="(" close=")" branch_close=")" separators="|">

  <mrow>

    <msub>

      <mrow data-mjx-texclass="ORD">

        <mi data-mjx-auto-op="false">NH</mi>

      </mrow>

      <mn>3</mn>

    </msub>    

  </mrow>    

</mfenced>

<mn>2</mn>

<mi data-mjx-auto-op="false">OH</mi>

<mrow data-mjx-texclass="ORD">

  <mi data-mjx-auto-op="false">CuSO</mi>

</mrow>

<mn>4</mn>

<mrow data-mjx-texclass="ORD">

  <mi data-mjx-auto-op="false">CuSO</mi>

</mrow>

<mn>4</mn>

<mi data-mjx-auto-op="false">Zn</mi>

<mi data-mjx-auto-op="false">Hg</mi>

<mi data-mjx-auto-op="false">HCl</mi>

<mi data-mjx-auto-op="false">Zn</mi>

<mi data-mjx-auto-op="false">Hg</mi>

<mi data-mjx-auto-op="false">HCl</mi>

Choose the correct answer from the options given below :

Match List - I with List - II.

Choose the correct answer from the options given below :

Statement I : Compound (X), shown below, dissolves in NaHCO₃ solution and has two chiral carbon atoms

Statement II : Compound (Y), shown below, has two carbons with sp³ hybridization, one carbon with sp² and one carbon with sp hybridization

In the light of the above statements, choose the correct answer from the options given below :

An organic compound " P " of molecular formula $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_3$ gives positive Iodoform test but negative Tollen's test. When " P " is treated with dilute acid, it produces " Q ". " Q " gives positive Tollen's test and also iodoform test. The structure of " P " is :

$$ \text { Identify A in the following reaction. } $$

Choose the correct option for structures of $A$ and $B$, respectively

Which among the following compounds give yellow solid when reacted with $\mathrm{NaOI} / \mathrm{NaOH}$ ?

Choose the correct answer from the options given below :

Aldol condensation is a popular and classical method to prepare $\alpha, \beta$-unsaturated carbonyl compounds. This reaction can be both intermolecular and intramolecular. Predict which one of the following is not a product of intramolecular aldol condensation?

An organic compound $(\mathrm{X})$ with molecular formula $\mathrm{C}_3 \mathrm{H}_6 \mathrm{O}$ is not readily oxidised. On reduction it gives $\mathrm{C}_3 \mathrm{H}_8 \mathrm{O}(\mathrm{Y})$ which reacts with HBr to give a bromide $(\mathrm{Z})$ which is converted to Grignard reagent. This Grignard reagent on reaction with $(\mathrm{X})$ followed by hydrolysis give 2,3-dimethylbutan-2-ol. Compounds $(\mathrm{X}),(\mathrm{Y})$ and $(\mathrm{Z})$ respectively are:

$$ \text {The major product }(\mathrm{P}) \text { in the following reaction is : } $$

Number of molecules from below which cannot give iodoform reaction is :

Ethanol, Isopropyl alcohol, Bromoacetone, 2-Butanol, 2-Butanone, Butanal, 2-Pentanone, 3-Pentanone, Pentanal and 3-Pentanol.

Consider the following reactions. From these reactions which reaction will give carboxylic acid as a major product ?

(A) $\quad \mathrm{R}-\mathrm{C} \equiv \mathrm{N} \xrightarrow[\text { mild condition }]{\text { (i) } \stackrel{+}{\mathrm{H}} / \mathrm{H}_2 \mathrm{O}}$

(B) $\quad \mathrm{R}-\mathrm{MgX} \xrightarrow[\text { (ii) } \mathrm{H}_3 \mathrm{O}^{+}]{\text {(i) } \mathrm{CO}_2}$

(C) $\mathrm{R}-\mathrm{C} \equiv \mathrm{N} \xrightarrow[\text { (ii) } \mathrm{H}_3 \mathrm{O}^{+}]{\text {(i) } \mathrm{SnCl}_2 / \mathrm{HCl}}$

(D) $\quad \mathrm{R} \cdot \mathrm{CH}_2 \cdot \mathrm{OH} \xrightarrow{\mathrm{PCC}}$

(E)

Choose the correct answer from the options given below :

Given below are two statements:

Statement I : Vanilin will react with NaOH and also with Tollen's reagent.

Statement II : Vanilin will undergo self aldol condensation very easily.

In the light of the above statements, choose the most appropriate answer from the options given below :

An optically active alkyl halide $\mathrm{C}_4 \mathrm{H}_9 \mathrm{Br}[\mathrm{A}]$ reacts with hot KOH dissolved in ethanol and forms alkene $[B]$ as major product which reacts with bromine to give dibromide $[C]$. The compound [C] is converted into a gas [D] upon reacting with alcoholic $\mathrm{NaNH}_2$. During hydration 18 gram of water is added to 1 mole of gas [D] on warming with mercuric sulphate and dilute acid at 333 K to form compound [E]. The IUPAC name of compound [ E ] is :

The product (P) formed in the following reaction is :

The total number of compounds from below when treated with hot KMnO₄, giving benzoic acid is:

Both acetaldehyde and acetone (individually) undergo which of the following reactions?

A. Iodoform Reaction

B. Cannizaro Reaction

C. Aldol Condensation

D. Tollen's Test

E. Clemmensen Reduction

Choose the correct answer from the options given below:

The compounds that produce $\mathrm{CO}_2$ with aqueous $\mathrm{NaHCO}_3$ solution are:

Choose the correct answer from the options given below:

Match List - I with List - II.

	List - I		List - II
(A)		(I)	Etard reaction
(B)		(II)	Gatterman-Koch reaction
(C)		(III)	Rosenmund reduction
(D)		(IV)	Stephen reaction

Choose the correct answer from the options given below :

Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?

Aman has been asked to synthesise the molecule He thought of preparing the molecule using an aldol condensation reaction. He found a few cyclic alkenes in his laboratory. He thought of performing ozonolysis reaction on alkene to produce a dicarbonyl compound followed by aldol reaction to prepare " $x$ ". Predict the suitable alkene that can lead to the formation of " $x$ ".

Given below are two statements:

Consider the following reaction

Statement (I): In the case of formaldehyde is about 2280, due to small substituents, hydration is faster.

Statement (II) : In the case of trichloro acetaldehyde is about 2000 due to $-$I effect of $-$Cl .

In the light of the above statements, choose the correct answer from the options given below :

The major product of the following reaction is :

$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}=\mathrm{O} \xrightarrow[\text { reflux }]{\substack{\text { excess } \mathrm{HCHO} \\ \text { alkali }}}$ ?

Residue (A) + HCl (dil) $\rightarrow$ Compound (B)

Structure of residue (A) and compound (B) formed respectively is :

The compounds which give positive Fehling's test are :

Choose the correct answer from the options given below :

In the above reaction product 'P' is

Which of the following compounds will give silver mirror with ammoniacal silver nitrate?

A. Formic acid

B. Formaldehyde

C. Benzaldehyde

D. Acetone

Choose the correct answer from the options given below :

Identify major product "X" formed in the following reaction :

What is the structure of C?

Identify the product (P) in the following reaction:

Consider the given reaction, identify the major product P.

Which among the following aldehydes is most reactive towards nucleophilic addition reactions?

Identify A and B in the given chemical reaction sequence :

Consider the given chemical reaction :

Product "A" is :

Identify 'A' in the following reaction :

Given below are two statements :

Statements I : Acidity of $$\alpha$$-hydrogens of aldehydes and ketones is responsible for Aldol reaction.

Statement II : Reaction between benzaldehyde and ethanal will NOT give Cross - Aldol product.

In the light of the above statements, choose the most appropriate answer from the options given below :

Identify the product in the following reaction:

Identify major product 'P' formed in the following reaction.

Identify the name reaction.

Salicylaldehyde is synthesized from phenol, when reacted with

m-chlorobenzaldehyde on treatment with 50% KOH solution yields :

This reduction reaction is known as:

Structure of 4-Methylpent-2-enal is :

Identify the reagents used for the following conversion

The molecular formula of second homologue in the homologous series of mono carboxylic acids is

Highest enol content will be shown by:

In the reaction given below

'A' is

The two products formed in above reaction are -

'A' in the above reaction is:

In the following reaction

'A' is

The major product 'P' formed in the following sequence of reactions is

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : A solution of the product obtained by heating a mole of glycine with a mole of chlorine in presence of red phosphorous generates chiral carbon atom.

Reason R : A molecule with 2 chiral carbons is always optically active.

In the light of the above statements, choose the correct answer from the options given below:

'A' and 'B' in the above reactions are:

The major product 'P' formed in the given reaction is

The major product formed in the following reaction is:

Match List I with List II:

	LIST I (Reagents used)		LIST II (Compound with Functional group detected)
A.	Alkaline solution of copper sulphate and sodium citrate	I.
B.	Neutral $$\mathrm{FeCl_3}$$	II.
C.	Alkaline chloroform solution	III.
D.	Potassium iodide and sodium hypochlorite	IV.

Choose the correct answer from the options given below:

In a reaction,

reagents 'X' and 'Y' respectively are :

The structures of major products A, B and C in the following reaction are sequence.

Consider the following reaction

The correct statement for product B is. It is

What is the correct order of acidity of the protons marked $$\mathrm{A}-\mathrm{D}$$ in the given compounds ?

Which of the following compounds would give the following set of qualitative analysis ?

(i) Fehling's Test : Positive

(ii) Na fusion extract upon treatment with sodium nitroprusside gives a blood red colour but not prussian blue.

Find out the major products from the following reaction sequence.

'A' in the given reaction is

Identify the product formed (A and E)

'R' formed in the following sequence of reactions is :

Compound (X) undergoes following sequence of reactions to give the Lactone (Y).

Correct structure of $$\gamma$$-methylcyclohexane carbaldehyde is

Consider the above reaction sequence, the Product 'C' is :

Find out the major product for the above reaction.

The structure of A in the given reaction is :

Match List - I with List - II.

	List - I		List - II
(A)		(I)	Gatterman Koch reaction
(B)	$$C{H_3} - CN\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{{H_3}{O^ + }}^{SnC{l_2}/HCl}} C{H_3} - CHO$$	(II)	Etard reaction
(C)		(III)	Stephen reaction
(D)		(IV)	Rosenmund reaction

Choose the correct answer from the options given below :

Consider the above reaction and predict the major product.

The products formed in the following reaction, A and B are

What is the major product of the following reaction?

$$C{H_3} - C{H_2} - CN\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{Ether}^{C{H_3}MgBr}} A\buildrel {{H_3}{O^ + }} \over \longrightarrow B\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{HCl}^{Zn - Hg}} C$$

The correct structure of C is

Which one of the following reactions does not represent correct combination of substrate and product under the given conditions?

Consider the given chemical reaction

Identify the product P.

Choose the reaction which is not possible:

Which among the following will be the major product of the given reaction?

Given below are two statements :

Statement I : The esterification of carboxylic acid with an alcohol is a nucleophilic acyl substitution.

Statement II : Electron withdrawing groups in the carboxylic acid will increase the rate of esterification reaction.

Choose the most appropriate option :

Isobutyraldehyde on reaction with formaldehyde and K₂CO₃ gives compound 'A'. Compound 'A' reacts with KCN and yields compound 'B', which on hydrolysis gives a stable compound 'C'. The compound 'C' is

The correct structure of product 'A' formed in the following reaction.

is

'A' and 'B' respectively are:

Which of the following reactions will yield benzaldehyde as a product?

Oxidation of toluene to benzaldehyde can be easily carried out with which of the following reagents?

The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is

The final product 'A' in the following reaction sequence

(C₇H₅O₂)₂ $$\buildrel {hv} \over \longrightarrow $$ [X] $$\to$$ 2C₆H₅ + 2CO₂

Consider the above reaction and identify the intermediate 'X'

Which will have the highest enol content?

Which of the following conditions or reaction sequence will NOT give acetophenone as the major product?

Two statements are given below :

Statement I : The melting point of monocarboxylic acid with even number of carbon atoms is higher than that of with odd number of carbon atoms acid immediately below and above it in the series.

Statement II : The solubility of monocarboxylic acids in water decreases with increase in molar mass.

Choose the most appropriate option :

' $x$ ' is the product which is obtained from benzene by reacting it with carbon monoxide and hydrogen chloride in the presence of cuprous chloride. ' $y$ ' is the major product obtained from the benzene by reacting it with ethanoyl chloride in the presence of anhydrous $\mathrm{AlCl}_3$. Product (major) obtained by heating $x$ and $y$ in the presence of alkali is $z$. Total number of $\pi$ (pi) electrons in $z$ is $\_\_\_\_$ .

$$ \text { Consider the following sequence of reactions to give the major product }(\mathrm{X}) $$

P g of the major product $(\mathrm{X})$ formed is reacted with $\mathrm{NaHCO}_3$ solution to liberate a gas which occupied $11.2 \mathrm{dm}^3$ at STP.

$$ \mathrm{P}=\text {______________ g. } $$

(Given molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{H}: 1, \mathrm{C}: 12, \mathrm{O}: 16, \mathrm{Cl}: 35.5$ )

Grignard reagent $\mathrm{RMgBr}(\mathrm{P})$ reacts with water and forms a gas $(\mathrm{Q})$. One gram of Q occupies $1.4 \mathrm{dm}^3$ at STP. (P) on reaction with dry ice in dry ether followed by $\mathrm{H}_3 \mathrm{O}^{+}$forms a compound (Z). 0.1 mole of (Z) will weigh $\_\_\_\_$ g. (Nearest integer)

Identify the structure of the final product (D) in the following sequence of the reactions :

Total number of $\mathrm{sp}^2$ hybridised carbon atoms in product D is ____________.

A compound ' $\mathrm{X}^{\prime}$ absorbs 2 moles of hydrogen and ' X ' upon oxidation with $\mathrm{KMnO}_4 \mid \mathrm{H}^{+}$ gives

The total number of $\sigma$ bonds present in the compound ' $X^{\prime}$ ' is __________.

Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous $$\mathrm{NaOH}$$ after heating gives $$x$$ as the major product. The number of $$\pi$$ bonds in the product $$x$$ is ______.

The product C in the following sequence of reactions has ________ $$\pi$$ bonds.

In the Claisen-Schmidt reaction to prepare $$351 \mathrm{~g}$$ of dibenzalacetone using $$87 \mathrm{~g}$$ of acetone, the amount of benzaldehyde required is _________ g. (Nearest integer)

Vanillin compound obtained from vanilla beans, has total sum of oxygen atoms and $$\pi$$ electrons is __________.

The product of the following reaction is P.

The number of hydroxyl groups present in the product P is ________.

The total number of 'Sigma' and 'Pi' bonds in 2-formylhex-4-enoic acid is _________.

From the compounds given below, number of compounds which give positive Fehling's test is _________.

Benzaldehyde, Acetaldehyde, Acetone, Acetophenone, Methanal, 4nitrobenzaldehyde, cyclohexane carbaldehyde.

The value of $$x$$ in compound 'D' is _________.

The mass of NH$$_3$$ produced when 131.8 kg of cyclohexanecarbaldehyde undergoes Tollen's test is ________ kg. (Nearest Integer)

Molar Mass of

C = 12g/mol

N = 14g/mol

O = 16g/mol

Number of isomeric compounds with molecular formula $$\mathrm{C}_{9} \mathrm{H}_{10} \mathrm{O}$$ which (i) do not dissolve in $$\mathrm{NaOH}$$ (ii) do not dissolve in $$\mathrm{HCl}$$. (iii) do not give orange precipitate with 2,4-DNP (iv) on hydrogenation give identical compound with molecular formula $$\mathrm{C}_{9} \mathrm{H}_{12} \mathrm{O}$$ is ____________.

Number of compounds from the following which will not dissolve in cold $\mathrm{NaHCO}_{3}$ and $\mathrm{NaOH}$ solutions but will dissolve in hot $\mathrm{NaOH}$ solution is ________.

A trisubstituted compound '$$\mathrm{A}$$', $$\mathrm{C}_{10} \mathrm{H}_{12} \mathrm{O}_{2}$$ gives neutral $$\mathrm{FeCl}_{3}$$ test positive. Treatment of compound 'A' with $$\mathrm{NaOH}$$ and $$\mathrm{CH}_{3} \mathrm{Br}$$ gives $$\mathrm{C}_{11} \mathrm{H}_{14} \mathrm{O}_{2}$$, with hydroiodic acid gives methyl iodide and with hot conc. $$\mathrm{NaOH}$$ gives a compound $$\mathrm{B}, \mathrm{C}_{10} \mathrm{H}_{12} \mathrm{O}_{2}$$. Compound 'A' also decolorises alkaline $$\mathrm{KMnO}_{4}$$. The number of $$\pi$$ bond/s present in the compound '$$\mathrm{A}$$' is _____________.

Number of compounds giving (i) red colouration with ceric ammonium nitrate and also (ii) positive iodoform test from the following is ___________

The number of stereoisomers formed in a reaction of $$(±)\mathrm{Ph}(\mathrm{C}=\mathrm{O}) \mathrm{C}(\mathrm{OH})(\mathrm{CN}) \mathrm{Ph}$$ with $$\mathrm{HCN}$$ is ___________.

$$\left[\right.$$where $$\mathrm{Ph}$$ is $$-\mathrm{C}_{6} \mathrm{H}_{5}$$]

The spin only magnetic moment of the complex present in Fehling's reagent is __________ B.M. (Nearest integer).

In the given reaction

The number of chiral carbon/s in product A is ___________.

A hydrocarbon 'X' is found to have molar mass of 80. A 10.0 mg of compound 'X' on hydrogenation consumed 8.40 mL of H₂ gas (measured at STP). Ozonolysis of compound 'X' yields only formaldehyde and dialdehyde. The total number of fragments/molecules produced from the ozonolysis of compound 'X' is _____________.

In the given reaction,

The number of $$\pi$$ electrons present in the product 'P' is _________.

A molecule ("P") on treatment with acid undergoes rearrangement and gives ("Q"). ("Q") on ozonolysis followed by reflux under alkaline condition gives (" $R$ "). The structure of (" $R$ ") is given below.

The structure of ("P") is