JEE Main 2006 Chemistry question

The increasing order of stability of the following free radicals is

(1)(CH_3)_2\dot CH < (CH_3)_3\dot C < (C_6H_5)_2\dot CH < (C_6H_5)_3\dot CCorrect
(2)(C_6H_5)_3\dot C < (C_6H_5)_2\dot CH < (CH_3)_3\dot C < (CH_3)_2\dot CH
(3)(C_6H_5)_2\dot CH < (C_6H_5)_3\dot C < (CH_3)_3\dot C < (CH_3)_2\dot CH
(4)(CH_3)_2\dot CH < (CH_3)_3\dot C < (C_6H_5)_3\dot C < (C_6H_5)_2\dot CH

Answer: (1)

Solution

Resonance delocalisation by phenyl groups stabilises radicals far more than hyperconjugation by methyl groups; more phenyl groups give more stability.

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Question ID VK-038816