Aldehyde and Ketone · Chemistry · COMEDK

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MCQ (Single Correct Answer)

1

Identify X, Y and Z formed in the reaction:

COMEDK 2025 Evening Shift Chemistry - Aldehyde and Ketone Question 1 English

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2

Which one of the following is the product $(\mathrm{Z})$ formed at the end of the given reaction:

$$\begin{aligned} & \text { Propan-1-ol }+\mathrm{SOCl}_2 \rightarrow[\mathrm{X}] \\ & {[\mathrm{X}]+\mathrm{HC} \equiv \mathrm{C}-\mathrm{Na} \rightarrow[\mathrm{Y}]} \\ & {[\mathrm{Y}]+\mathrm{H}_2 \mathrm{SO}_4 / \mathrm{HgSO}_4, 330 \mathrm{~K} \rightarrow[\mathrm{Z}]} \end{aligned}$$

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3
Choose the incorrect statement.
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4
An organic compound " A " reacts with $\mathrm{Zn} / \mathrm{Hg}$ / Conc. HCl to form p-Xylene. It reduces Tollen's reagent and on oxidation with $\mathrm{KMnO}_4 / \mathrm{H}^{+}$it yields 1, 4-benzenedicarboxylic acid. Identify compound A.
COMEDK 2025 Afternoon Shift
5

Two statements, one Assertion (A) and the other Reason (R) are given. Choose the correct option.

Assertion: Compound $[\mathrm{X}]$ reacts with Hydrazine in presence of $\mathrm{KOH} /$ Glycol to form the product $[\mathrm{Y}]$.

COMEDK 2025 Morning Shift Chemistry - Aldehyde and Ketone Question 6 English

Reason: Reduction reaction occurs and Carbonyl group is reduced to Methylene group.

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6
Which one of the following reactions does not give the correct combination of reactants and the major products formed in the reaction?
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7

Identify $[\mathrm{X}]$, the final product formed when 2 moles of Ethanal undergoes the following series of reactions with reagents [(i) to (iv)]

COMEDK 2025 Morning Shift Chemistry - Aldehyde and Ketone Question 5 English

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8

Identify the end-product [D] formed when solution salicylate undergoes the following series of reactions

COMEDK 2024 Evening Shift Chemistry - Aldehyde and Ketone Question 9 English

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9

Given are the names of 4 compounds. Two of these compounds will not undergo Cannizzaro's reaction. Identify the two.

A. 2-Chlorobutanal

B. 2,2-Dimethylpropanal

C. Benzaldehyde

D. 2-Phenyl ethanol

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10

What is/are the product/s formed when Benzaldehyde and Ethanal react in presence of dil. $$\mathrm{NaOH}$$ followed by heating the intermediate product formed?

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11

Which one of the following is the correct order of reagents to be used to convent [A] to [X] ?

COMEDK 2024 Evening Shift Chemistry - Aldehyde and Ketone Question 8 English

$$ \text { Reagents: } \mathrm{PCC}, \mathrm{PCl}_5, \mathrm{LiAlH}_4, \frac{\mathrm{KCN}}{\mathrm{H}_3 \mathrm{O}^{+}} $$

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12

Predict the final major product 'S' of the following reaction

COMEDK 2024 Afternoon Shift Chemistry - Aldehyde and Ketone Question 12 English

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13

Which of the following compounds undergo Aldol condensation followed by dehydration to give 3-phenylprop-2-en-1-al?

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14

$$\text { Identify }[\mathrm{B}] \text { and }[\mathrm{C}] \text { formed in the reactions given below. }$$

COMEDK 2024 Morning Shift Chemistry - Aldehyde and Ketone Question 14 English

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15

Which one of the following statements is incorrect regarding acetal and ketal formation when Propanal and Propanone are separately reacted with Ethanol in presence of anhydrous $$\mathrm{HCl}$$ gas.

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16

A Carbonyl compound $$\mathrm{X}$$ when reacted with Methyl magnesium bromide followed by hydrolysis gave product $$\mathrm{Y}$$. When $$\mathrm{Y}$$ is heated with $$\mathrm{Cu}$$ at $$573 \mathrm{~K}$$, it gave $$\mathrm{Z}$$ (2- Methylbut-2-ene) as one of the products. Identify $$\mathrm{X}$$.

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17

Identify the Reagents I and II to be used in the course of the given reactions.

COMEDK 2024 Morning Shift Chemistry - Aldehyde and Ketone Question 15 English

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18

Product of the following reaction is

COMEDK 2023 Morning Shift Chemistry - Aldehyde and Ketone Question 23 English

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19

Acetophenone when reacted with a base, $$\mathrm{C}_2 \mathrm{H}_5 \mathrm{ONa}$$, yields a stable compound which has the structure

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20

Which of the following is incorrect?

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21

Which one of the following compounds would not undergo Aldol condensation?

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22

From among the following, identify the compound which forms two moles of a ketone on ozonolysis.

[A] 2,3-Dimethylbutane.

[B] 3-Methyl-1-pentene.

[C] 2,3-Dimethyl-2-butene.

[D] 2-Methyl-2-pentane.

COMEDK 2023 Evening Shift
23

Identify the final product formed during the course of the given reactions.

Pentan-2-one $$\xrightarrow{\mathrm{NaCN} / \mathrm{HCl}}[\mathrm{X}]$$

$$[\mathrm{X}] \xrightarrow[95 \% \mathrm{H}_3 \mathrm{PO}_4]{\Delta \text { with }}[Y]$$

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24

What would be the products obtained when a mixture of p-Methoxy benzaldehyde and Methanal are heated with $$50 \%$$ concentrated Caustic soda solution?

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25

X and Y in the following reactions are

COMEDK 2022 Chemistry - Aldehyde and Ketone Question 26 English

COMEDK 2022
26

Find the product formed for the given reaction.

$$\mathrm{{C_6}{H_5}CHO + {H_3}C - C{H_2} - CHO\buildrel {Dil.\,NaOH/\Delta } \over \longrightarrow}$$

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27

Find the final product for the reaction

COMEDK 2021 Chemistry - Aldehyde and Ketone Question 30 English

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28

Reaction

COMEDK 2021 Chemistry - Aldehyde and Ketone Question 29 English

find the product B.

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29

The product formed when hydroxylamine condenses with a carbonyl compound is called

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30

The reagent used in Clemmenson's reduction is

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