Acetylene reacts with $HCN$ in the presence of $Ba(CN)_2$ to yield

Predict the correct intermediate and product in the following reaction: $CH_3-C \equiv CH \xrightarrow[HgSO_4]{H_2O, H_2SO_4} \text{Intermediate } (A) \to \text{Product } (B)$

The poisonous gas 'Lewisite' is obtained by the reaction of:

For a molecular formula of $C_6H_{10}$ of an alkyne series,the number of possible branched isomers is

What is obtained when calcium carbide reacts with heavy water?

The bond length between the hybridized carbon atom and another carbon atom is minimum in: