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Question

Compare the stability of given free radicals

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

The correct option is B C > B > A
Here all the structures having 1α - hydrogen so stability of the free radical cannot be explained by α-hydrogen
Stability of free radical+ Inductive effect 1- Inductive effect
Here, NO2 shows more I effect than CN, so it will destabilise the radical more than CN
CH3 shows +I effect and it stabilises the free radical.
Hence the correct order of stability of free radical is
C>B>A

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