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# The catalyst used for the preparation of the monomer of neoprene rubber is

$\begin{array}{1 1}(a)\;Ba(CN)_2&\\(b)\;Cu_2Cl_2,NH_4Cl,HCl\\(c)\;Cu_2Cl_2\\(d)\;HCl,H_2SO_4\end{array}$

Neoprene rubber is prepared by free radical polymerisation of chloroprene (2-chlorobuta-1, 3-diene),The chloroprene is obtained by dimerisation of acetylene by passing it through aqueous solution of $NH_4Cl$ and cuprous chloride at 343K followed by treatment with HCl.
Hence (b) is the correct answer.