Solved: CHEMISTRY Question for NEET

NEET CHEMISTRYMedium

Given below are two statements: Statement I: Primary aliphatic amines react with $HNO_2$ to give unstable diazonium salts. Statement II: Primary aromatic amines react with $HNO_2$ to form diazonium salts which are stable even above $300\text{ K}$ . In the light of the above statements, choose the most appropriate answer from the options given below:

Statement I is incorrect but Statement II is correct

Both Statement I and II are correct

Both Statement I and II are incorrect

Statement I is correct but Statement II is incorrect

Step-by-Step Solution

Statement I (Correct): Primary aliphatic amines react with nitrous acid ( $HNO_2$ ) to form alkyl diazonium salts. These salts are highly unstable and immediately decompose to yield primary alcohols and nitrogen gas.
Statement II (Incorrect): Primary aromatic amines react with $HNO_2$ to form aryl diazonium salts. These salts are relatively stable only at low temperatures, strictly between $273\text{ K}$ to $278\text{ K}$ ( $0^\circ\text{C}$ to $5^\circ\text{C}$ ). They are unstable and decompose when the temperature is raised, so they are not stable above $300\text{ K}$ .
Conclusion: Therefore, Statement I is correct, and Statement II is incorrect.

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