Predict the products formed by sodium hydroxide-promoted dehydrohalogenation of the following compounds. In each case. predict which will be the major product.
(a) 1 -bromobutane
(b) 2 -chlorobutane
(c) 3-bromopentane
(d) 1-bromo-1-methylcyclohexane
(e) cis-1-bromo-2-methylcyclohexane
(f) trans-l-bromo-2-methylcyclohexane