Which one of the following compounds does not give benzoic acid when treated with alkaline $\mathrm{KMnO}_4$ ?

Consider the following

Statement I Kolbe's electrolysis of sodium propionate gives $n$-hexane as product.

Statement II In Kolbe's process $\mathrm{CO}_2$ is liberated at anode and $\mathrm{H}_2$ is liberated at cathode.

Correct answer is

The catalyst used for the isomerisation of $n$-alkanes to branched chain alkanes is

What are $X$ and $Y$ respectively, in the following set of reactions?