MHTCET 16 Apr 2026 Shift 2 Paper

Concept:The boiling point of amines depends on the extent of intermolecular hydrogen bonding.Explanation:Tertiary amines have the general structure $R_3\mathrm{N}$.In this structure, nitrogen is bonded to three alkyl groups and has no hydrogen atom attached to it.Intermolecular hydrogen bonding in amines requires the presence of an $N-H$ bond.Primary amines $R\mathrm{NH}_2$ and secondary amines $R_2\mathrm{NH}$ possess $N-H$ bonds, so they can form intermolecular hydrogen bonds.Tertiary amines $R_3\mathrm{N}$ do not have an $N-H$ bond, so they cannot form intermolecular hydrogen bonds.Due to the absence of intermolecular hydrogen bonding, tertiary amines have weaker intermolecular forces than primary and secondary amines of comparable molar mass.Hence, less energy is required to separate their molecules, which results in the lowest boiling points among amines.Therefore, the correct answer is Option D.Answer:Option D: They do not possess inter-molecular H-bonding.