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Question

Rank the following intermediates according to the stability (most stable first).
CH3CH2CH2˙CH2,CH3˙CHCH2CH3,(CH3)2˙CCH2CH3,and (CH3)3˙C

A
(CH3)2˙CCH2CH3>(CH3)3˙C>˙CHCH2CH3>CH3CH2CH2˙CH2
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B
CH3CH2CH2˙CH2>(CH3)2˙CCH2CH3>˙CHCH2CH3>(CH3)3˙C
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C
(CH3)3˙C>(CH3)2˙CCH2CH3>(CH3)˙CHCH2CH3>CH3CH2CH2˙CH2
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D
(CH3)3˙C<(CH3)2˙CCH2CH3<(CH3)˙CHCH2CH3<CH3CH2CH2˙CH2
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Solution

The correct option is D (CH3)3˙C>(CH3)2˙CCH2CH3>(CH3)˙CHCH2CH3>CH3CH2CH2˙CH2
The stability of free radicals increases as we go from primary to secondary to tertiary carbons. Electron releasing groups (+I effect) increases the stability of a free radical.

The order of stability is (CH3)2˙CCH2CH3>(CH3)3˙C>CH3˙CHCH2CH3>CH3CH2CH2˙CH2.

The inductive effect of CH2CH3 is greater than CH3

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