Scheme $1$ and $2$ describe the conversion of $P$ to $Q$ and $R$ to $S$,respectively. Scheme $3$ describes the synthesis of $T$ from $Q$ and $S$. The total number of $Br$ atoms in a molecule of $T$ is. . . . . . . .

Arrange the following sets of compounds in order of their increasing boiling points:
$(a)$ Pentan$-1-$ol,butan$-1-$ol,butan$-2-$ol,ethanol,propan$-1-$ol,methanol.
$(b)$ Pentan$-1-$ol,$n-$butane,pentanal,ethoxyethane.

Which of the following reactions involves the formation of a carbene intermediate?

Choose the correct option by putting $T$ for the true statement and $F$ for the false statement.
$(i)$ Phenol is more acidic as compared to ethanol.
$(ii)$ Melting point of $o$-nitrophenol is lesser than $p$-nitrophenol.
$(iii)$ Neutralization of phenol is done with $NaHCO_3$.
$(iv)$ Nucleophilic substitution reaction is taking place in the aromatic ring of phenol.

When a mixture of ethanol and methanol is heated in the presence of concentrated $H_2SO_4$,the resulting organic product or products is/are:

The major product in the following reaction sequence is: