The most stable free radical among the following is (1)C6H5CH2C˙H2(2)C6H5C˙HCH3(3)CH3C˙HCH3(4)C˙6H5

 Answer: (2)C6H5C˙HCH3


We know that a radical’s stability is determined by its intrinsic energy. If the radical’s internal energy is very high, it is unstable; if the radical’s internal energy is very low, it is stable. It’s worth noting that the electron-donating groups boost the radical’s stability. Hyperconjugation and resonance are used to stabilise a radical. As a result, when compared to other radicals, a benzylic radical will be extremely stable. The free radical in C6H5CH2C.H2 is not stabilised by resonance. The radical in CH3C.HCH3,C.6H5 cannot undergo resonance. The radical can, however, resonate with the benzyl ring in C6H5C.HCH3. As a result, it will be the most stable of the free radicals.

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