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Hyperconjugation

Rank the foll...

Question

Rank the following free radicals in increasing order of their stability.

A

A > B > C > D

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B

D > C > B > A

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C

A > C > D > B

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D

C > A > D > B

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Solution

The correct option is A $D > C > B > A$
Order of stability will be $D > C > B > A$
$D =$ This free radical has two effects that make it most stable,i.e the free radical is allylic as well as tertiary.
$C =$ It is the only allylic position. So, it is $2 n d$ most stable
$B =$ It is tertiary free radical.
$A =$ It is secondary free radical.

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