A) \[I>II>III>IV\]
B) \[III>II>I>IV\]
C) \[II>I>IV>III\]
D) \[IV>III>I>II\]
Correct Answer: D
Solution :
On the basis of hyperconjugation the order of stability of given free radicals is as follows : \[\underset{benzyl\,\,F.\,\,r.}{\mathop{{{C}_{6}}{{H}_{5}}\overset{\bullet }{\mathop{C}}\,{{H}_{2}}}}\,>C{{H}_{2}}\underset{allyl\text{ }F.r}{\mathop{=CH-\overset{\bullet }{\mathop{C}}\,}}\,{{H}_{2}}>\underset{methyl\text{ }F.r}{\mathop{\overset{\bullet }{\mathop{C}}\,{{H}_{3}}}}\,\]\[\underset{Vinyl\text{ }F.r}{\mathop{>C{{H}_{2}}=\overset{\bullet }{\mathop{C}}\,H}}\,\]
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