How many metameric ethers are represented by the molecular formula $C_4H_{10}O$?

Match the structures of the compounds given in Column-$I$ with the names of the compounds given in Column-$II$.

Column-$I$	Column-$II$
$(i)$ $2-$methylphenol	$(a)$ Hydroquinone
$(ii)$ Benzene$-1,2-$diol	$(b)$ Phenetole
$(iii)$ Benzene$-1,3-$diol	$(c)$ Catechol
$(iv)$ Benzene$-1,4-$diol	$(d)$ $o$-Cresol
$(v)$ Methoxybenzene	$(e)$ Quinone
$(vi)$ Ethoxybenzene	$(f)$ Resorcinol
	$(g)$ Anisole

Sum of number of $1^o$ alcoholic groups in product $(P)$ and $(Q)$ is

When phenol is treated with $CHCl_3$ and $NaOH$ followed by acidification,salicylaldehyde is produced. Which of the following intermediates is involved in the above reaction?

The increasing order of the boiling points for the following compounds is
$C_2H_5OH$ $(I)$,$C_2H_5Cl$ $(II)$,$C_2H_5CH_3$ $(III)$,$C_2H_5OCH_3$ $(IV)$

Match List-$I$ with List-$II$. Choose the correct answer from the options given below: