Write a short note on 'Wurtz reaction'.

What happens when sodium propionate is heated with soda lime?

What is Wurtz reaction? Give an example of it.

A hydrocarbon having the formula ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}+2}$ diffuses twice as fast as ${\mathrm{SO}}_2$ at the same temperature. Calculate the value of $\mathrm{n}$.

Name the alkanes which are obtained when a mixture of methyl iodide and ethyl iodide is treated with metallic sodium and dry ether. Explain the formation of alkanes with equations.