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AIPMT PRELIMS2007Chemistry-Organic Chemistry

AIPMT PRELIMS 2007 Chemistry Alkynes MCQ Question

Type: MCQ-conceptual-Medium-Class 11

Predict the product C obtained in the following reaction of butyne^{-1}.

CH3CH2−C≡CH+HCl⟶B→HIC\text{CH}_3\text{CH}_2 - \text{C} \equiv \text{CH} + \text{HCl} \longrightarrow \text{B} \xrightarrow{\text{HI}} \text{C}

A

CH3−CH2−CH2−C∣ClI∣−H\text{CH}_3 - \text{CH}_2 - \text{CH}_2 - \overset{\substack{\text{I} \\ |}}{\underset{\substack{| \\ \text{Cl}}}{\text{C}}} - \text{H}

B

CH3−CH2−CHI∣−CH2Cl\text{CH}_3 - \text{CH}_2 - \overset{\substack{\text{I} \\ |}}{\text{CH}} - \text{CH}_2\text{Cl}

C

CH3CH2−C∣ClI∣−CH3\text{CH}_3\text{CH}_2 - \overset{\substack{\text{I} \\ |}}{\underset{\substack{| \\ \text{Cl}}}{\text{C}}} - \text{CH}_3

D

CH3−CH∣Cl−CH2CH2I\text{CH}_3 - \underset{\substack{| \\ \text{Cl}}}{\text{CH}} - \text{CH}_2\text{CH}_2\text{I}

Correct Answer

Option b

Detailed Explanation

The addition of HCl to butyne−1e^{-1} follows Markovnikov's rule, leading to the formation of a secondary chloride.

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