MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryGOCPrevious Year Questions

A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following? (NEET 2020)

A.–I effect of –CH3 groups

B.+R effect of –CH3 groups

C.–R effect of –CH3 groups

D.Hyperconjugation✓ Correct

Explanation

tert-Butyl carbocation, 3 3 CH C is more stable than sec-butyl carbocation 3 2 CH CH due to hyperconjugation. 3 3 CH C has nine C–H bonds while 3 2 CH CH has six C–H bonds. Thus, there is more hyperconjugative structures in tert-butyl carbocation.

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