For the following reactions : (a) CH₃CH₂CH₂Br + KOH → CH₃CH=CH₂ + KBr + H₂O (b) (CH3)2CHBr + KOH -> (CH3)2CHOH + KBr (structures shown in figure) (c) cyclohexene + Br₂ -> 1,2-dibromocyclohexane (structures shown in figure) Which of the following statements is correct ? 1. (a) and (b) are elimination reactions and (c) is addition reaction. 2. (a) is elimination, (b) is substitution and (c) is addition reaction. 3. (a) is elimination, (b) and (c) are substitution reactions. 4. (a) is substitution, (b) and (c) are addition reactions.

Answer: 2. (a) is elimination, (b) is substitution and (c) is addition reaction. Key idea: identify what happens to the substrate. (a) CH₃CH₂CH₂Br to propene: HBr is lost, so it is an elimination. (b) (CH₃)₂CHBr+KOH→(CH₃)₂CHOH : Br is replaced by OH, so it is substitution. (c) Cyclohexene + Br₂ : the double bond adds two Br atoms, so it is an addition. This matches option 2.

Topic: Mechanisms of substitution reactions (SN1/SN2)· Organic Compounds Containing Halogens

For the following reactions :(a) CH_3CH_2CH_2Br + KOH → CH_3CH=CH_2 + KBr + H_2O(b) (CH3)2CHBr + KOH -> (CH3)2CHOH + KBr (structures shown in figure)(c) cyclohexene + Br_2 -> 1,2-dibromocyclohexane (structures shown in figure)Which of the following s…

For the following reactions :

(a) \(CH_3CH_2CH_2Br + KOH \rightarrow CH_3CH=CH_2 + KBr + H_2O\)

(b) (CH3)2CHBr + KOH -> (CH3)2CHOH + KBr (structures shown in figure)

Which of the following statements is correct ?

structural formulas of reactions (b) and (c)

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

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

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

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

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Answer: 2. (a) is elimination, (b) is substitution and (c) is addition reaction.

Key idea: identify what happens to the substrate.

(a) \(\mathrm{CH_3CH_2CH_2Br}\) to propene: HBr is lost, so it is an elimination.
(b) \(\mathrm{(CH_3)_2CHBr+KOH\to(CH_3)_2CHOH}\): Br is replaced by OH, so it is substitution.
(c) Cyclohexene + \(\mathrm{Br_2}\): the double bond adds two Br atoms, so it is an addition.

This matches option 2.

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For the following reactions :(a) CH_3CH_2CH_2Br + KOH → CH_3CH=CH_2 + KBr + H_2O(b) (CH3)2CHBr + KOH -> (CH3)2CHOH + KBr (structures shown in figure)(c) cyclohexene + Br_2 -> 1,2-dibromocyclohexane (structures shown in figure)Which of the following s…

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