Salol is obtained from which of the following substances?

Phenol $+$ Aniline $\xrightarrow[{KOH}]{{C_6H_5N_2^+Cl^{-}}}$ Major Product $:$ Product will be $:$

Phenol $\stackrel{X}{\longrightarrow}$ forms a tribromo derivative. "$X$" is

Amongst the following,the total number of compounds soluble in aqueous $NaOH$ is:

Which of the following groups increases the acidity of phenol?

Some compounds and their $pK_a$ values are given. Arrange them in decreasing order of their acidic strength.
$(i)$ Ethanol $(15.9)$,Phenol $(10.0)$,Cresol $(10.1)$,Water $(15.7)$
$(ii)$ $o$-Nitrophenol $(7.2)$,$m$-Nitrophenol $(8.3)$,Ethanol $(15.9)$,Water $(15.7)$,Phenol $(10.0)$