Which of the following is a characteristic test for the phenolic group?

Which of the following is a true statement about the reaction shown?

Which of the following phenols has the largest $pK_a$ value (i.e.,is least acidic)?

The major product formed in the following reaction is:

Choose the incorrect option based on the reaction:
$(P)$ + $CH_3-CO-Cl \rightarrow (Q)$
Where $(P)$ is salicylic acid and the structure of $(Q)$ is given as:
$(Q)$ is a benzene ring with an $-OH$ group and a $-COO-CO-CH_3$ group at ortho position.

Which one of the following compounds will not be soluble in sodium bicarbonate?