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Gouri Shankar posted an Question

October 16, 2020 • 13:20 pm

30 points

IIT JAM
Chemistry (CY)

Which of the following carbocation will undergo rearrangement??

1 Answer(s)

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Shivaji khadake

dear student whatever option you have given here at both should not given Carbocation rearrangement because double 1,2 shift is not possible at normal condition but 1,2 shift after that ring expansion and then methyl transfer is possible so correct answer will be B. thank you very much for asking this question best luck
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Dinesh khalmaniya 1

only B undergoes rearrangement. Reason - After each arrangement in the carbocation, the newly formed carbocation must be more stable than previous one. if not then rearrangement is not possible. stability can be checked by Aromaticity, resonance, hyperconjugation etc. Check below attachment to understand concept....
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Priyanshu kumar

Rearrangement is possible only in B Carbocation rearrangement can occur twice,thrice but the condition is that every time after rearrangement there is increase in stability
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also in 1st case number of hc h atom increases
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no see after first rearrangement stability decreases
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At last stability increases but after first carbocation rearrangement stability decreases
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hope you got this
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Suman Kumar

only B will go rearrangement
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why????
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After every rearrangement carbocation formed must be more stable than previous
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see this
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stability is reduced so rearrangement will not occur
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