The correct order of increasing reactivity… - NEET UG 2010 Chemistry PYQ

NEET UG 2010 — Chemistry Organic Chemistry

2010mcqhard

The correct order of increasing reactivity of $\mathrm{C} \mathrm{X}$ bond towards nucleophile in the following compounds is NEET 2010 Chemistry, Haloalkanes and Haloarenes — question figure

Official previous-year question

Held on 30 Apr 2010 · Verified 9 Jul 2026.

Options

A
I $<$ II $<$ IV $<$ III
B
II $<$ III $<$ I $<$ IV
C
IV $<$ III $<$ I $<$ II
D
III $<$ II $<$ I $<$ IV

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Solution

Key Idea Alkyl halides are more reactive towards nucleophilic substitution. Reactivity depends upon the stability of carbocation intermediate formed. Among the given halides, aryl halide $\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{X}\right)$ is least reactive towards nucleophile as in it the $\mathrm{C}-\mathrm{X}$ bond acquire some double bond character due to resonance. Presence of electron withdrawing groups like $-\mathrm{NO}_2$ at ortho and para positions facilitate the nucleophilic displacenent of $-\mathrm{X}$ of aryl halide. Among alkyl halides, $3^{\circ}$ halides are more reactive as compared to $2^{\circ}$ halides due to the formation of more stable carbocation. Hence, the order of reactivity of $\mathrm{C}-\mathrm{X}$ bond towards nucleophile is as NEET 2010 Chemistry, Haloalkanes and Haloarenes — solution figure

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