The product $(A)$ is:

Which of the following does not have intermolecular hydrogen bonding?

$p$-aminophenol reacts with one equivalent of acetyl chloride in the presence of pyridine to give mainly

$A$ hydrocarbon $A$ $(C_{4}H_{8})$ on reaction with $HCl$ gives a compound $B$ $(C_{4}H_{9}Cl)$ which on reaction with $1 \ mol$ of $NH_{3}$ gives compound $C$ $(C_{4}H_{11}N)$. On reacting with $NaNO_{2}$ and $HCl$ followed by treatment with water,compound $C$ yields an optically active compound $D$. The compound $D$ is

Which isomeric amine has the lowest boiling point?

Which of the following is the strongest Bronsted base?