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(B) The stability of free radicals is determined by factors such as resonance,hyperconjugation,and the inductive effect.$(II)$ $C_6H_5 - \dot{CH_2}$ (

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$II > I > IV > III$

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(B) The stability of free radicals is determined by factors such as resonance,hyperconjugation,and the inductive effect.$(II)$ $C_6H_5 - \dot{CH_2}$ (Benzyl radical) is resonance-stabilized by the phenyl ring,making it the most stable.$(I)$ $CH_3 - \dot{CH} - CH_3$ is a secondary $(2^{\circ})$ radical with $6$ alpha-hydrogen atoms,providing significant hyperconjugation.$(IV)$ $\dot{CH_2} - CH_3$ is a primary $(1^{\circ})$ radical with $3$ alpha-hydrogen atoms.$(III)$ $\dot{CH_2} - CH(CH_3)_2$ is a primary $(1^{\circ})$ radical with only $1$ alpha-hydrogen atom.Comparing the hyperconjugation,the order of stability for the remaining radicals is $I > IV > III$.Thus,the overall order of stability is $II > I > IV > III$.

Compare the stability of the following free radicals:
$(1)$ $CH_3 - \dot{CH} - CH_3$
$(2)$ $C_6H_5 - \dot{CH_2}$
$(3)$ $\dot{CH_2} - CH(CH_3)_2$
$(4)$ $\dot{CH_2} - CH_3$

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Compare the stability of the following free radicals:$(1)$ $CH_3 - \dot{CH} - CH_3$$(2)$ $C_6H_5 - \dot{CH_2}$$(3)$ $\dot{CH_2} - CH(CH_3)_2$$(4)$ $\dot{CH_2} - CH_3$