Which one of the following substituents at para position is most effective in stabilizing the phenoxide ion?

Which of the following can not react with $NaHCO_3$?

The major product formed in the following reaction is:

The reaction of phenol with concentrated $HNO_3$ is given by:
Phenol $\xrightarrow{Conc. HNO_3}$ Product
What is the major product?

One mole of phenol is treated with dilute $HNO_3$ at $298 \ K$ to give a mixture of products. The mixture is separated by steam distillation. The steam volatile compound $(X)$ is separated. The increase in percentage of oxygen in $(X)$ with respect to phenol is . . . . . . $\times 10^{-1}$ %. (Given molar mass in $g \ mol^{-1}$: $H:1, C:12, N:14, O:16$)

Which of the following compounds is the most acidic?