This secondary carbocation can rearrange to a more stable tertiary carbocation by a methyl groupshift.Loss of a proton from the 1,2-dimethylcyclohexyl cation intermediate yields 1,2-dimethylcyclo-hexene.5.17(b)All the hydrogens of tert-butyl chloride are equivalent. Loss of any of these hydrogens alongwith the chlorine substituent yields 2-methylpropene as the only alkene.(c)All the bhydrogens of 3-bromo-3-ethylpentane are equivalent, so that b-elimination can giveonly 3-ethyl-2-pentene.(d)There are two possible modes of b-elimination from 2-bromo-3-methylbutane. Elimination inone direction provides 3-methyl-1-butene; elimination in the other gives 2-methyl-2-butene.The major product is the more highly substituted alkene, 2-methyl-2-butene. It is the morestable alkene and corresponds to removal of a hydrogen from the carbon that has the fewerhydrogens.(e)Regioselectivity is not an issue here, because 3-methyl-1-butene is the only alkene that can be
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