Which alkane is secreted by cockroaches to attract the opposite gender of its species?

Wurtz reaction of methyl iodide yields an organic compound $X$. Which one of the following reactions also yields $X$?

Complete the following reactions for the pyrolysis of $n$-hexane and kerosene:

In which of the following reactions does the carbon number not change on product formation?
$(i)$ Hydrogenation
$(ii)$ Alkyl halide reduction
$(iii)$ Wurtz reaction
$(iv)$ Decarboxylation
$(v)$ Kolbe reaction

Reaction of ethyl chloride with sodium leads to

In which of the following reactions is the product not an alkane?