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Question:

For the following reactions, which of the following statements is correct?

(a) is elimination, (b) is substitution and (c) is addition reaction.

(a) is elimination, (b) and (c) are substitution reactions.

(a) is substitution, (b) and (c) are addition reactions.

(a) and (b) are elimination reactions and (c) is addition reaction.

Solution:

(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.