Question:
Which of the following statements is NOT correct?
Which of the following statements is NOT correct?
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Classify amines by the number of alkyl groups on nitrogen, not on carbon.
Updated On: Oct 1, 2026
- Primary amines show intermolecular hydrogen bonds.
- Tertiary butylamine is a primary amine.
- Tertiary amines do not show inter molecular hydrogen bonds.
- iso-propylamine is a secondary amine.
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Amines are classed as primary, secondary or tertiary by the number of carbon groups attached to the nitrogen atom.
Step 2: Detailed Explanation:
(A) Primary amines have N-H bonds, so they form intermolecular hydrogen bonds. This is correct.
(B) Tertiary butylamine is \((\text{CH}_3)_3\text{C-NH}_2\). The nitrogen carries only one alkyl group, so it is a primary amine. The word "tertiary" refers to the carbon. This is correct.
(C) Tertiary amines have no N-H bond, so no intermolecular hydrogen bonding. This is correct.
(D) Isopropylamine is \((\text{CH}_3)_2\text{CH-NH}_2\). Nitrogen again carries only one alkyl group, so it is primary. Calling it secondary is wrong.
Step 3: Final Answer:
The incorrect statement is (D).
Final Answer:
Isopropylamine is a primary amine, not secondary. \[ \boxed{\text{(D) }\text{(D) is not correct}} \]
Amines are classed as primary, secondary or tertiary by the number of carbon groups attached to the nitrogen atom.
Step 2: Detailed Explanation:
(A) Primary amines have N-H bonds, so they form intermolecular hydrogen bonds. This is correct.
(B) Tertiary butylamine is \((\text{CH}_3)_3\text{C-NH}_2\). The nitrogen carries only one alkyl group, so it is a primary amine. The word "tertiary" refers to the carbon. This is correct.
(C) Tertiary amines have no N-H bond, so no intermolecular hydrogen bonding. This is correct.
(D) Isopropylamine is \((\text{CH}_3)_2\text{CH-NH}_2\). Nitrogen again carries only one alkyl group, so it is primary. Calling it secondary is wrong.
Step 3: Final Answer:
The incorrect statement is (D).
Final Answer:
Isopropylamine is a primary amine, not secondary. \[ \boxed{\text{(D) }\text{(D) is not correct}} \]
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