The structure of salol is

Which of the following will be most easily attacked by an electrophile?

The following reaction sequence is given:
Phenol $\xrightarrow{NaOH} X$ $\xrightarrow[(ii) H^+]{(i) CO_2} Y$ $\xrightarrow{(CH_3CO)_2O/H^+} Z + CH_3COOH$
The correct statements about $Z$ from the following are:
$I$. It is $o$-hydroxybenzoic acid.
$II$. It is a non-narcotic analgesic.
$III$. It acts as antipyretic.
$IV$. It acts as antihistamine.

In the Liebermann nitroso reaction,what is the sequence of color changes observed in phenol?

What are $X$ and $Y$ in the following reactions?

What is the product obtained by heating the following allylic ether of phenol?