Which of the following compounds has maximum volatility?

Compound $'P'$ on nitration with dil. $HNO_{3}$ yields two isomers $(A)$ and $(B).$ These isomers can be separated by steam distillation. Isomers $(A)$ and $(B)$ show the intramolecular and intermolecular hydrogen bonding respectively. Compound $(P)$ on reaction with conc. $HNO_{3}$ yields a yellow compound $'C',$ a strong acid. The number of oxygen atoms present in compound $'C'$ is:

When phenol is treated with $CHCl_3$ and $NaOH$,which of the following products is obtained?

The major product formed in the following reaction is:

Which of the following reagents can be used to distinguish between phenol and ethanoic acid?

Hybridisation shown by Carbon and Oxygen of $-OH$ group in phenol are respectively . . . . . . .