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For the following reactions: (1) CH3CH2CH2Br + KOH → CH3CH=CH2 + KBr + H2O (2) CH3CH=CH2 + Br2 → CH3CHBrCH2Br (3) CH3CHBrCH2Br + KOH → CH3CH(OH)CH2Br Which of the following statements is correct?

1. (a) (1) and (2) are elimination reactions and (3) is addition reaction
2. (b) (1) is elimination, (2) is substitution and (3) is addition reaction
3. (c) (1) is elimination, (2) and (3) are substitution reactions
4. (d) (1) is substitution, (2) and (3) are addition reactions

Correct answer: (c) (1) is elimination, (2) and (3) are substitution reactions

Solution

Reaction (1) is an elimination reaction as HBr is removed to form an alkene. Reaction (2) is an addition reaction where Br2 adds across the double bond. Reaction (3) is a substitution reaction where -OH replaces one Br atom.

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