Some Basic Concepts of Organic Chemistry · Chemistry · NEET
MCQ (Single Correct Answer)
$$ \text { The following carbocation is stabilized by the interaction of the empty } p \text { orbital with } $$
$$ \text { The correct IUPAC name of the following compound is : } $$
During Lassaigne's test, the elements present in an organic compound are converted from :
How many products (including stereoisomers) are expected from monochlorination of the following compound?
Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula $\mathrm{C}_4 \mathrm{H}_8 \mathrm{O}$ is :
Among the given compounds I-III, the correct order of bond dissociation energy of C-H bond marked with * is :
Match List-I with List-II
| List - I (Mixture) |
List - II (Method of separation) |
||
|---|---|---|---|
| A | $\mathrm{CHCl}_3+\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2$ | I | Distillation under reduced pressure |
| B | Crude oil in petroleum industry | II | Steam distillation |
| C | Glycerol from spent-lye | III | Fractional distillation |
| D | Aniline - water | IV | Simple distillation |
Choose the correct answer from the options given below:
Which one of the following compounds can exist as cis-trans isomers?
Match List-I with List-II
| List - I (Ion) |
List - II (Group Number in Cation Analysis) |
||
|---|---|---|---|
| A | $\mathrm{Co}^{2+}$ | I | Group-I |
| B | $\mathrm{Mg}^{2+}$ | II | Group-III |
| C | $\mathrm{Pb}^{2+}$ | III | Group-IV |
| D | $\mathrm{Al}^{3+}$ | IV | Group-VI |
Choose the correct answer from the options given below :
The correct IUPAC name of the compound
is :
A steam volatile organic compound which is immiscible with water has a boiling point of $$250^{\circ} \mathrm{C}$$. During steam distillation, a mixture of this organic compound and water will boil :
Match List-I with List-II :
| List - I (Test/reagent) |
List - II (Radical identified) |
||
|---|---|---|---|
| (A) | Lake Test | (I) | NO$$_3^-$$ |
| (B) | Nessler's Reagent | (II) | Fe$$^{3+}$$ |
| (C) | Potassium sulphocyanide | (III) | Al$$^{3+}$$ |
| (D) | Brown Ring Test | (IV) | NH$$_4^+$$ |
Choose the correct answer from the options given below :
Methyl group attached to a positively charged carbon atom stabilizes the carbocation due to
Given below are two statements:
Statement I : The boiling point of three isomeric pentanes follows the order
n-pentane > isopentane > neopentane
Statement II : When branching increases, the molecule attains a shape of sphere. This results in smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the boiling point.
In the light of the above statements, choose the most appropriate answer from the options given below:
The most stable carbocation among the following is :
A compound with a molecular formula of $$\mathrm{C}_6 \mathrm{H}_{14}$$ has two tertiary carbons. Its IUPAC name is :
On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as
During the preparation of Mohr's salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of $$\mathrm{Fe}^{2+}$$ ion?
Which amongst the following compounds/species is least basic?
Which amongst the following compounds will show geometrical isomerism?
The correct order for the rate of $$\alpha,\beta$$-dehydrohalogenation for the following compounds is _________.
Given below are two statements:
Statement I : In an organic compound, when inductive and electromeric effects operate in opposite directions, the inductive effect predominates.
Statement II : Hyperconjugation is observed in o-xylene.
In the light of the above statements, choose the correct answer from the options given below :
The number of $$\sigma$$ bonds, $$\pi$$ bonds and lone pair of electrons in pyridine, respectively are:
In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with $$\mathrm{Fe}^{3+}$$ due to the formation of-
Amongst the given options which of the following molecules/ion acts as a Lewis acid?
Consider the following compounds/species:
The number of compounds/species which obey Huckel's rule is ___________.
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Chlorine is an electron withdrawing group but it is ortho, para directing in electrophilic aromatic substitution.
Reason (R) : Inductive effect of chlorine destabilises the intermediate carbocation formed during the electrophilic substitution, however due to the more pronounced resonance effect, the halogen stabilises the carbocation at ortho and para positioins.
In the light of the above statements, choose the most appropriate answer from the options given below :
Predict the order of reactivity of the following four isomers towards SN2 reaction.
(I) CH3CH2CH2CH2Cl
(II) CH3CH2CH(Cl)CH3
(III) (CH3)2CHCH2Cl
(IV) (CH3)3CCl
What is the hybridization shown by C1 and C2 carbons, respectively in the given compound?
OHC $$-$$ CH = CH $$-$$ CH2COOCH3
Which of the following is the most stable carbocation?
Which compound amongst the following is not an aromatic compound?
The incorrect statement regarding chirality is
The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?
The correct IUPAC name of the following compound is
Which of the given compounds can exhibit tautomerism?
Hyperconjunction occurs in
I and II are
Increasing order of stability of the radicals is
is aromatic because it has
CH3CH$$=$$CHC$$ \equiv $$CH is
CH$$ \equiv $$C$$-$$CH$$=$$CH2 is
is in the order of
is in the order of
CH3CH$$=$$CHCH2CHBrCH3
(i) benzene
(ii) toluene
(iii) chlorobenzene
(iv) phenol
is
How many structural isomers are possible when one of the hydrogen is replaced by a chlorine atom ?
CH2 $$=$$ CH $$-$$ CH2 $$-$$ CH2 $$-$$ C $$ \equiv $$ CH
