Compare the stability of given free radicals

A > B > C

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C > B > A

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B > C > A

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A > C > B

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Solution

The correct option is B C > B > A
Here all the structures having $1 α$ - hydrogen so stability of the free radical cannot be explained by $α$ -hydrogen
$Stability of free radical \propto + Inductive effect \propto \frac{1}{- Inductive effect}$
Here, $N O_{2}$ shows more $- I$ effect than $C N$ , so it will destabilise the radical more than $C N$
$C H_{3}$ 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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Stability of Free Radical

Standard XII Chemistry

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