Question

Which of the following is the most stable free redical?

• A. $CH_{3}\overset{\bullet}{C}H_{2}$
• B. $CH_{3}\overset{\bullet}{C}HCH_{3}$
• C. $CH_{3}\overset{\bullet}{C}HC_{6}H_{5}$
• D. $C_{6}H_{5}CH_{2}\overset{\bullet}{C}H_{2}$

Answer 1

Answer: (C)

$CH_{3}\overset{\bullet}{C}HC_{6}H_{5}$

Answer 2

: The stability order of free radicals are $3^{{^\circ}} > 2^{{^\circ}} > 1^{{^\circ}}$Because of hyperconjugation and resonance $CH_{3}CH_{6}H_{5}$is most stable.

shows both resonance and

Hyperconjugation