What is obtained when calcium carbide reacts with heavy water?

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

The product formed in the above reaction is

What is the major organic product of the following reaction?
$Ph-C \equiv CH \xrightarrow[H_2SO_4]{Hg^{2+}, H_2O} ?$

The major organic compound formed by the reaction of $1, 1, 1-$trichloroethane with silver powder is:

The acidic hydrogen is present in $ . . . . . . $.