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(B) The reaction of acetylene $(HC \equiv CH)$ with dilute $H_2SO_4$ in the presence of $HgSO_4$ is a hydration reaction.First,it forms vinyl alcohol

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(B) The reaction of acetylene $(HC \equiv CH)$ with dilute $H_2SO_4$ in the presence of $HgSO_4$ is a hydration reaction.First,it forms vinyl alcohol $(CH_2=CH-OH)$,which is unstable and undergoes tautomerization to form acetaldehyde $(CH_3CHO)$.The structure of acetaldehyde is $CH_3-C(=O)H$.In the $C=O$ bond,there is $1$ $\sigma$ bond and $1$ $\pi$ bond.Therefore,the final product acetaldehyde contains $1$ $\pi$ bond.

When acetylene is passed through a solution of dilute sulfuric acid containing mercuric sulfate,the number of $\pi$ bonds in the final product obtained is.........

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