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NEET CHEMISTRYAminesMedium

Question

Given below are two statements: Statement I: Primary aliphatic amines react with HNO2HNO_2 to give unstable diazonium salts. Statement II: Primary aromatic amines react with HNO2HNO_2 to form diazonium salts which are stable even above 300 K300\text{ K}. In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is incorrect but Statement II is correct

B

Both Statement I and II are correct

C

Both Statement I and II are incorrect

D

Statement I is correct but Statement II is incorrect

Step-by-Step Solution

  1. Statement I (Correct): Primary aliphatic amines react with nitrous acid (HNO2HNO_2) to form alkyl diazonium salts. These salts are highly unstable and immediately decompose to yield primary alcohols and nitrogen gas.
  2. Statement II (Incorrect): Primary aromatic amines react with HNO2HNO_2 to form aryl diazonium salts. These salts are relatively stable only at low temperatures, strictly between 273 K273\text{ K} to 278 K278\text{ K} (0C0^\circ\text{C} to 5C5^\circ\text{C}). They are unstable and decompose when the temperature is raised, so they are not stable above 300 K300\text{ K}.
  3. Conclusion: Therefore, Statement I is correct, and Statement II is incorrect.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Amines. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYAminesstatementsstatementprimaryaliphaticamines

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Which of the following statements about primary amines is false?

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