JEE Class main Answered

Dear Student,

Basis the stability of carbocation and carbanions, the correct answer option is b.

Tertiary carbocation and primary carbanion are the most stable structures. 

Hence first carbocation would form by attack of H+ ion on 2-methylprop-1-ene followed by the formation of carbanion by loss of H+ ion from Isobutane. Neative charge due to the lone pair of electrons in carbanion attack positive charge on carbocation which gives structure given in option b.