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# Which of these will not react with acetylene?

$\begin{array}{1 1}(a)\;NaOH&(b)\;\text{Ammoniacal }AgNO_3\\(c)\;Na&(d)\;HCl\end{array}$

Being a very weak acid $(Ka\approx 10^{-25}$),acetylene does not react with NaOH or KOH.But it reacts with very strong base.(E.g.$NaNH_2$)