The order of rate of hydrolysis of alkyl halides 1°, 2°, 3° and CH3X by the SN2 pathway is

Question

The order of rate of hydrolysis of alkyl halides 1°, 2°, 3° and CH3X by the SN2 pathway is (A) 1° >2° >3° >CH3X (B) CH3X>3o>2o>1o (C) CH3X>1o>2o>3o (D) 3o>2o>1o>CH3X

Tardigrade Admin · Accepted Answer

For SN2 reaction reactivity propto (1/s t e r i c h i n d e r a n c e) textS textN 2 textNu + textR - textX overset textslow arrow underset textTransitionstate textNu ldots textR ldots textX overset textFast arrow textNu - textR + textX- Order of reactivity: CH3X>1o>2o>3o.

Q. The order of rate of hydrolysis of alkyl halides 1°, 2°, 3° and $C H_{3} X$ by the $S_{N} 2$ pathway is

$1^{\circ} > 2^{\circ} > 3^{\circ} > C H_{3} X$

$C H_{3} X > 3^{o} > 2^{o} > 1^{o}$

$C H_{3} X > 1^{o} > 2^{o} > 3^{o}$

$3^{o} > 2^{o} > 1^{o} > C H_{3} X$

For $S_{N} 2$ reaction reactivity $\propto \frac{1}{s t er i c hin d er an ce}$
$S_{N} 2 Nu + R - X \to slow Transitionstate Nu \dots R \dots X \to Fast Nu - R + X^{-}$
Order of reactivity: $C H_{3} X > 1^{o} > 2^{o} > 3^{o} .$

Q. The order of rate of hydrolysis of alkyl halides 1°, 2°, 3° and CH3​X by the SN​2 pathway is

1∘>2∘>3∘>CH3​X

CH3​X>3o>2o>1o

CH3​X>1o>2o>3o

3o>2o>1o>CH3​X