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# The no of $\pi$ bonds in the product formed by passing acetylene through dil $H_2SO_4$ containing mercuric sulphate

$\begin{array}{1 1}(a)\;zero&(b)\;one\\(c)\;two&(d)\;three\end{array}$

$CH =CH+H_2O \overset{dil/H_2SO_4/HgSO_4}{\Large\rightarrow} CH_3CHO$
One $\pi$ bond.
Hence (b) is the correct answer.