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Arrange the following alkyl halides in d...

Arrange the following alkyl halides in decreasing order of the rate or `beta`-elimination reaction alcoholic KOH.
A. `CH_(3)-underset(CH_(3))underset(|)overset(H)overset(|)(C)-CH_(2)Br`
B. `CH_(3)-CH_(2)-Br`
C. `CH_(3)-CH_(2)-CH_(2)-Br`

A

A gt Bgt C

B

C gt B gt A

C

B gt C gt A

D

A gt C gtB

Text Solution

Verified by Experts

The correct Answer is:
D
More the number of `beta`-substituents, more stable alkene it will give on `beta`-elimination. Since (A) has two, (C ) has one `beta`-methyl substituent while (B) have no `beta`-methyl substituent, therefore, reactivity towards `beta`-elimination decreases in the order : A gt C gt B
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