Identify the product $P$ obtained in the following reaction: $C_6H_5OH + HCHO \xrightarrow{\text{Acid}} P$

Product $(A)$ and $(B)$ respectively are $:-$

$C_6H_6 + CH_3-CH=CH_2$ $\xrightarrow{H_3PO_4} A$ $\xrightarrow{O_2, \text{heat}} B$ $\xrightarrow{\text{dil. } H_2SO_4} C + D$. $A, C$ and $D$ are:

When phenol is treated with chloroform in the presence of sodium hydroxide,followed by hydrolysis in the presence of an acid,the product formed is:

$C_6H_5OH \xrightarrow[Br_2]{OH^{\ominus}} ; $ Intermediate of the given reaction is/are

What is the name of the following reaction?