Catalyst used in dimerisation of acetylene to prepare chloroprene is

1.	Catalyst used in dimerisation of acetylene to prepare chloroprene is
Answer» `HgSO_4+ H_2SO_4` `Cu_2Cl_2` `Cu_2Cl_2 + NH_4OH` `Cu_2Cl_2+ NH_4Cl` Solution :`UNDERSET"ACETYLENE"(HC-=CH+HC-=CH)overset(Cu_2Cl_2+NH_4Cl)to underset"VINYLACETYLENE"(H-C-=C-CH_2)overset"HCL"to underset"Chloroprene"(H_2C=oversetoverset(Cl)\|C-CH=CH_2)`

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