Which one of the following phenols does not give colour when condensed with phthalic anhydride in the presence of conc. $H_2SO_4$?

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

An organic compound with molecular formula $C_7H_8O$ dissolves in $NaOH$ and gives a characteristic colour with $FeCl_3$. On treatment with bromine,it gives a tribromo derivative $C_7H_5OBr_3$. The compound is

Which of the following is the strongest Bronsted acid?

How many $\sigma$ (sigma) and $\pi$ (pi) bonds are present respectively in the final product obtained by the Reimer-Tiemann reaction of phenol?

Benzene $+ CH_3CH_2CH_2Cl$ $\xrightarrow{AlCl_3} M$ $\xrightarrow{(i) O_2/\Delta , (ii) H_3O^+} N + \text{phenol}$. Here $M$ and $N$ are