Given below are two statements :

Statement I : On heating with ${\mathrm{KHSO}}_4$, glycerol is dehydrated and acrolein is formed.

Statement II : Acrolein has fruity odour and can be used to test glycerol's presence.

Choose the correct option.

Identify the major product $\mathrm{A}$ and $\mathrm{B}$ for the below given reaction sequence.

The major product in the given reaction is

The ether compound in the below reaction is heated with Conc. $\mathrm{HI}$ to give a hydroxy compound $\mathrm{A}$ which is further heated with $\mathrm{Zn}$ dust to give compound $\mathrm{B}$. Identify $\mathrm{A}$ and $\mathrm{B}$.

$\mathrm{A}$' and '$\mathrm{B}$' formed in the following set of reactions are:

In the cumene to phenol preparation in presence of air, the intermediate is