Assertion (A) : Methyl bromide is more reactive than ethyl bromide towards $S_{N} 2$ reactions.
Rason (R) : Stability of methyl carbocation is greater than ethyl carbocation

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A is true but R is false

Both A and R are false

Both A and R are true and R explains A

Both A and R are true but R doesn’t explain A

answer is C.

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Detailed Solution

$S_{N} 2 reactivity \propto \frac{1}{Steric hindrance}$

$S_{N} 1 reactivity \propto stability of carbocation$

Correct reason : Steric hindrance is ${CH}_{3} Br$ lesser than in $C_{2} H_{5} Br$

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