Q44 / 150 · MHT CET 2026 (16 April Shift 1) · Chemistry
Which of the following statements is NOT correct?
- APrimary amines show intermolecular hydrogen bonds.
- BTertiary butylamine is a primary amine.
- CTertiary amines do not show inter molecular hydrogen bonds.
- Correct answerDiso-propylamine is a secondary amine.
Solution
Primary amines have the general formula $R-NH_2$. Since they have two hydrogen atoms attached to the highly electronegative nitrogen atom, they can form intermolecular hydrogen bonds.
Tertiary butylamine has the structure $(CH_3)_3C-NH_2$. The nitrogen atom is attached to only one carbon atom, making it a primary amine.
Tertiary amines have the general formula $R_3N$. They do not have any hydrogen atoms attached to the nitrogen atom, so they cannot form intermolecular hydrogen bonds with each other.
iso-propylamine has the structure $(CH_3)_2CH-NH_2$. The nitrogen atom is attached to only one carbon atom. Therefore, it is a primary amine, not a secondary amine. The classification of amines depends on the number of alkyl groups attached to the nitrogen atom, not the degree of the carbon atom it is attached to.
Answer: iso-propylamine is a secondary amine.
Tertiary butylamine has the structure $(CH_3)_3C-NH_2$. The nitrogen atom is attached to only one carbon atom, making it a primary amine.
Tertiary amines have the general formula $R_3N$. They do not have any hydrogen atoms attached to the nitrogen atom, so they cannot form intermolecular hydrogen bonds with each other.
iso-propylamine has the structure $(CH_3)_2CH-NH_2$. The nitrogen atom is attached to only one carbon atom. Therefore, it is a primary amine, not a secondary amine. The classification of amines depends on the number of alkyl groups attached to the nitrogen atom, not the degree of the carbon atom it is attached to.
Answer: iso-propylamine is a secondary amine.
Hence, the correct answer is option: 'D'.