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My attempt:

After getting the carbocation after protonation, in order to form a more stable alkene, it rearranged the methyl group on the adjacent carbon so as to get the alkene in the option (b). I am confused that whether it should be "1,2 hydride shift" or should it be "1,2 methyl shift" because the migratory aptitude of $\ce{H-}$ group is more than $\ce{CH3-}$ but here if carbocation formation is the RDS (considering E1) should we not rearrange it to a more stable species?

  • 1
    $\begingroup$ try considering the fact that 'b' is more substituted as compared to 'a' $\endgroup$ Jun 12 at 10:32
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    $\begingroup$ Have a look into this chemistry.stackexchange.com/q/161776/115228 $\endgroup$
    – Infinite
    Jun 12 at 13:37
  • $\begingroup$ Thank you so much, I did get the answer and the logic behind it 😀 $\endgroup$
    – asymptotes
    Jun 12 at 15:54
  • $\begingroup$ If you have satisfied with any answer try upvoting it. It gives encouragement for the users :-) $\endgroup$
    – Infinite
    Jun 12 at 16:13


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