Identify ' $B$ ' in the following reaction.

$$\mathrm{C}_2 \mathrm{H}_6 \xrightarrow[\mathrm{AlBr}_3]{\mathrm{Br}_2} A \xrightarrow[\Delta]{\mathrm{CH}_3 \mathrm{COOAg}} B$$

What is the range of number of carbon atoms in alkanes found in paraffin wax?

Identify the hydrocarbon compound from following containing carbon atoms in the range of $$\mathrm{C}_6$$ to $$\mathrm{C}_8$$ ?

The alkane formed on heating sodium butanoate with sodalime is