For the reaction $R - CH_2 - CCl_2 - R \xrightarrow{?} R - C \equiv C - R$,the suitable reagent is........

Which of the following compounds contains an acidic hydrogen?

What is obtained by the reaction of calcium carbide with heavy water?

The number of $\sigma$ and $\pi$ bonds between two carbon atoms in calcium carbide are

Reactant $P$ (an alkyne) gives products $Q$ (trans-alkene) or $R$ (cis-alkene).
The possible reagents are:
$(I) \ 2Na/liq. NH_3$
$(II) \ H_2/Pd/CaCO_3$ (quinoline)
$(III) \ 2H_2/Pd/C$
Which of the following statements is/are correct with respect to the above conversion?

Predict the nature of $P$ in the following reaction:
$CH_3-C\equiv C-CH_3 \xrightarrow[heat]{NaNH_2 / \text{inert solvent}} P$