Haloalkanes And Haloarenes Question 13
Question 13 - 2024 (31 Jan Shift 2)
The correct order of reactivity in electrophilic substitution reaction of the following compounds is :
A
B
C
(1) $\mathrm{B}>\mathrm{C}>\mathrm{A}>\mathrm{D}$
(2) $\mathrm{D}>\mathrm{C}>\mathrm{B}>\mathrm{A}$
(3) $\mathrm{A}>\mathrm{B}>\mathrm{C}>\mathrm{D}$
(4) $\mathrm{B}>\mathrm{A}>\mathrm{C}>\mathrm{D}$
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Answer (4)
Solution
Formula: Electrophilic Substitution Reaction
$-\mathrm{CH}_{3}$ shows $+\mathrm{M}$ and $+\mathrm{I}$.
$-\mathrm{Cl}$ shows $+\mathrm{M}$ and $-\mathrm{I}$ but inductive effect dominates.
$-\mathrm{NO}_{2}$ shows $-\mathrm{M}$ and $-\mathrm{I}$.
Electrophilic substitution $\alpha \frac{1}{-\mathrm{M} \text { and -I }}$
$\alpha+\mathrm{M}$ and $+\mathrm{I}$
Hence, order is $\mathrm{B}>\mathrm{A}>\mathrm{C}>\mathrm{D}$.
