What is obtained when calcium carbide reacts with heavy water?

$A$ mixture of ethane,ethene,and ethyne is passed through ammoniacal $AgNO_3$ solution. The gases which remain unreacted are

The major product of the following reaction is:

Which one of the following classes of compounds is obtained by the cyclic polymerization of acetylene?

The best sequence of reactions to prepare $2$-heptanone is

Give a brief note on the acidic nature of alkynes.