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Question

Which of the following is true regarding the stability of the following carbocation?

A
I<II
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B
II<I
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C
I=II
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D
None of the above
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Solution

The correct option is A I<II
(II) is more stable since it has five αH atoms whereas (I) has three αH atoms. That is why (I) undergoes ring expansion by 1,2-hydride shift. The shifts are always 1,2 not 1,3.

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