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# The most stable free radical among the following is

$(a)\;C_6H_5CH_2 \\(b)\;C_6H_5CHCH_3 \\(c)\;CH_3CH_2 \\(d)\;CH_3CHCH_3$

The most stable free radical is $C_6H_5CHCH_3$ because of resonance.
Hence b is the correct answer.