$C_{2} H_{2} + 2 HCl \to C_{2} H_{4} {Cl}_{2}$ is an example of

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Addition reaction

Hydrogenation reaction

Substitution reaction

Chlorination reaction

answer is A.

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Detailed Solution

When alkynes react with halo acid addition reaction takes place and dihaloalkanes are produced in accordance with markonikoffs rule here ethyne reacts with HCl to produce 1,2-dichloroethane

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Hence option A is the correct answer.

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