Catalyst used in dimerisation of acetylene to prepare chloroprene is:

H g S O_{4} + H_{2} S O_{4}

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C u_{2} C l_{2}

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C u_{2} C l_{2} + N H_{4} C l

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C u_{2} C l_{2} + N H_{4} O H

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Solution

The correct option is C $C u_{2} C l_{2} + N H_{4} C l$

Acetylene dimerized to give vinyl acetylene when it combines with hydrogen chloride to form 4-chloro-1, 2-butadiene, an allene derivative, which in presence of cuprous chloride $(C u_{2} C l_{2})$ and ammonium chloride $(N H_{4} C l)$ , rearranges to form 2- Chlorobuta-1 , 3-diene.

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