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Nucleophilic Substitution Reaction

A mixture of ...

Question

A mixture of $C_{2} H_{6}, C_{2} H_{4}$ and $C_{2} H_{2}$ is bubbled through alkaline solution of copper (I) chloride, contained in Woulf's bottle. The gas coming out is :

A

original mixture

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B

C_{2} H_{6}

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C

C_{2} H_{6}

and

C_{2} H_{4}

mixture

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D

C_{2} H_{4}

and

C_{2} H_{2}

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Solution

The correct option is B $C_{2} H_{6}$ and $C_{2} H_{4}$ mixture
$H C \equiv C H + C u C l ⟶ H C \equiv C^{o} C l ↓$

Alkynes react with alkaline $C u C l$ forming a precipitate. While alkanes and alkenes are inert to reactions with CHCl. As a result when the mixture is bubbled through the solution, ethyne $C_{2} H_{2}$ is absorbed and gas coming out contains ethane $C_{2} H_{6}$ and ethene $C_{2} H_{4}$

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