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For the following reactions
Which of the following statements is correct?

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(i) is elimination, (ii) is substitution and (iii) is addition

(i) is elimination, (ii) and (iii) are substitution

(i) is substitution, (ii) and (iii) are addition reactions

(i) and (ii) are elimination reactions and (iii) is addition reaction

answer is A.

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Detailed Solution

(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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