back to directory
NEET CHEMISTRYHaloalkanes and HaloarenesMedium

Question

When hydrolyzed with aqueous KOH, compounds that undergo racemization are: (i) [Image Missing] (ii) CH3CH2CH2Cl\text{CH}_3\text{CH}_2\text{CH}_2\text{Cl} (iii) [Image Missing] (iv) [Image Missing]

A

(i) and (ii)

B

(ii) and (iv)

C

(iv) only

D

(i) and (iv)

Step-by-Step Solution

Racemization during hydrolysis with aqueous KOH indicates that the reaction proceeds via an SN1S_N1 mechanism, which involves the formation of a planar carbocation intermediate. For a compound to undergo racemization, it must be chiral (optically active) and form a relatively stable carbocation (such as secondary, tertiary, benzylic, or allylic).

Compound (ii), 1-chloropropane (CH3CH2CH2Cl\text{CH}_3\text{CH}_2\text{CH}_2\text{Cl}), is an achiral primary alkyl halide. It typically undergoes SN2S_N2 substitution and cannot exhibit racemization.

Since the structural formulas for compounds (i), (iii), and (iv) are missing from the provided text, their chirality and carbocation stability cannot be independently evaluated. Therefore, the exact correct option cannot be definitively verified.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Haloalkanes and Haloarenes. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYHaloalkanes and Haloareneshydrolyzedaqueouscompoundsundergoracemization

More Haloalkanes and Haloarenes Questions

View all

In the given reaction the product P is:

A.[Image Missing]
B.[Image Missing]
C.4
D.[Image Missing]
MediumSolve

Given below is a reaction sequence: $\text{CH}_3\text{CH}_2\text{Cl} \xrightarrow{\text{NaCN}} X \xrightarrow{\text{H}_2/\text{Ni}} Y \xrightarrow{\text{Acetic Anhydride}} Z$ The product '$Z$' in the above reaction is:

A.$\text{CH}_3\text{CH}_2\text{CH}_2\text{NHCOCH}_3$
B.$\text{CH}_3\text{CH}_2\text{CH}_2\text{NH}_2$
C.$\text{CH}_3\text{CH}_2\text{CH}_2\text{CONHCH}_3$
D.$\text{CH}_3\text{CH}_2\text{CH}_2\text{CONHCOCH}_3$
MediumSolve

The $\text{-OH}$ group of an alcohol or the carboxylic acid can be replaced by $\text{-Cl}$ using:

A.Hypochlorous acid
B.Chlorine
C.Hydrochloric acid
D.Phosphorous pentachloride
EasySolve

The correct order of increasing C-X bond reactivity toward nucleophiles among the following is: I. [Missing] II. [Missing] III. $(\text{CH}_3)_3\text{C-X}$ IV. $(\text{CH}_3)_2\text{CH-X}$

A.I < II < IV < III
B.II < III < I < IV
C.IV < III < I < II
D.III < II < I < IV
MediumSolve

Which of the following methods is incorrect for the synthesis of alkenes?

A.Treatment of alkynes with Na in liquid $\text{NH}_3$
B.Heating alkyl halides with alcoholic $\text{KOH}$
C.Treating alkyl halides in aqueous $\text{KOH}$ solution
D.Treating vicinal dihalides with Zn metal
MediumSolve

The correct reaction among the following is:

A.Reaction 1
B.Reaction 2
C.Reaction 3
D.Reaction 4
MediumSolve

The major product formed in the dehydrohalogenation reaction of 2-bromopentane is pent-2-ene. This product formation is based on:

A.Hofmann Rule
B.Huckel's Rule
C.Saytzeff's Rule
D.Hund's Rule
EasySolve

A reaction among the following can generate isonitriles as a major product. (A) $\text{R-X} + \text{HCN} \rightarrow$ (B) $\text{R-X} + \text{AgCN} \rightarrow$ (C) $\text{R-X} + \text{KCN} \rightarrow$ (D) $\text{R-X} + \text{NaCN} \xrightarrow{\text{C}_2\text{H}_5\text{OH}/\text{H}_2\text{O}}$ Choose the most appropriate answer from the options given below:

A.(D) only
B.(C) and (D) only
C.(B) only
D.(A) and (B) only
MediumSolve

This neet chemistry practice question is part of the TopperSquare free question bank. TopperSquare offers 15,000+ chapter-wise NEET MCQs across Physics, Chemistry, and Biology with detailed step-by-step explanations, full mock tests, NEET PYQs (2010–2024), and an AI-powered performance analytics dashboard. browse all neet practice questions → · practice chemistry sets →