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

The reaction in which 2 molecules of chlorobenzene reacts with metallic sodium in presence of dry ether forming diphenyl is an example of,