(f)Two alkenes may be formed here. The more highly substituted one is 1-methylcyclohexene,and this is predicted to be the major product in accordance with Zaitsev’s rule.5.18Elimination in 2-bromobutane can take place between C-1 and C-2 or between C-2 and C-3. Thereare three alkenes capable of being formed: 1-butene and the stereoisomerscis-2-butene andtrans-2-butene.As predicted by Zaitsev’s rule, the most stable alkene predominates. The major product istrans-2-butene.5.19An unshared electron pair of the base methoxide (CH3O2) abstracts a proton from carbon. The pairof electrons in this C@H bond becomes the pcomponent of the double bond of the alkene. The pairof electrons in the C@Cl bond becomes an unshared electron pair of chloride ion.5.20The most stable conformation of cis-4-tert-butylcyclohexyl bromide has the bromine substituent inan axial orientation. The hydrogen that is removed by the base is an axial proton at C-2. This
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