A) \[IV<II<III<I\]
B) \[I<II<III<IV\]
C) \[IV<I<III<II\]
D) \[IV<I<II<III\]
Correct Answer: A
Solution :
\[S_{N}^{1}\] reaction is favoured for \[3{}^\circ \]alkyl halide. For a given system BE of \[C-Cl>C-Br,\]I with phenyl group gives resonance stabilized carbocation. Thus, increasing order is\[IV<II<III<\text{ }I\]
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