JEE CHEMISTRY MCQ: HALOALKANES AND HALO ARENES

1 Easy

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Analyzing +4 | -1

Consider the reaction:

(i)

\left({CH}_3\right)_2 {CH}-{CH}_2 {Br} \stackrel{{C}_2 {H}_5 {OH}}{\longrightarrow}\left({CH}_3\right)_2 {CH}-{CH}_2 {OC}_2 {H}_5+{HBr}

(ii)

\left({CH}_3\right)_2 {CH}-{CH}_2 {Br} \stackrel{{C}_2 {H}_5 {O}^{-}}{\longrightarrow}\left({CH}_3\right)_2 {CH}-{CH}_2 {OC}_2 {H}_5+{Br}^{-}

The mechanisms of reaction (i) and (ii) are respectively :-

View answer and explanation

Correct option: D

{S}{{N}^2}

and

{S}{{N}^2}

Option B (

{S}{{N}^1}

and

{S}{{N}^2}

) is correct because reaction (i) with

C_2H_5OH

favors

S_N1

due to the formation of a carbocation, while reaction (ii) with

C_2H_5O^-

favors

S_N2

due to the strong nucleophile.

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