What is the number of moles of ethane obtained from $$2 n$$ moles of bromomethane using $$2 n$$ moles of sodium atoms in dry ether medium?

Which of the following is formed when propene is heated with bromine at high temperature?

Which among the following is benzylic halide?

Identify '$$B$$' in the following conversions

$$\mathrm{CH}_3 \mathrm{Br} \xrightarrow{\mathrm{KCN}} A \xrightarrow{\mathrm{Na} / \mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}} B$$