Which of the following alcohols has lowest boiling point?

Crotonyl alcohol is an example of

When a mixture of vapours of phenol and hydrogen is passed over nickel catalyst at 433 K, the product obtained is

Identify the product $$(\mathrm{A})$$ obtained in the following reaction.

$$\text { Phenol + concentrated Nitric acid } \xrightarrow[\mathrm{H}_2 \mathrm{SO}_4]{\text { concectrated }} \mathrm{A}$$