(a) is elimination, (b) is substitution and (c) is addition reaction.
(a) is elimination, When an alkyl bromide is heated with alcoholic KOH solution, a molecule of HBr is eliminated to form C=C double bond. (b) is substitution When secondary alkyl bromide is heated with aqueous KOH, bromine atom is substituted with −OH group. (c) is addition reaction A molecule of bromine is added across C=C double bond.
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