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Question

What is correct order of stability of the following carbocations:
A. +CH2−CH3
B. +CH2−CH2Cl
C. +CH2−CHCl2
D. +CH2−CCl3

A
A>B>C>D
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B
A>C>B>D
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C
D>C>B>A
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D
D>B>C>A
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Solution

The correct option is A A>B>C>D
Since Cl is an electron withdrawing group, it shows I effect.
Higher the number of Cl atoms attached, higher the stability of carbocation, because it neutralizes the positive charge more.
In option D, there are maximum number of Cl atoms attached to carbon.
So it will be the most stable, followed by C then B and A which is least stable.

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