Which of the following amine will form stable diazonium salt at 273-283 K ?a)C6H5NH2b)C6H5N(CH3)2c)C2H5NH2d)C6H5CH2NH2Correct answer is option 'A'. Can you explain this answer?

Question

Answer

The correct answer is Option A.
Aromatic Primary amine will form the most stable diazonium salt because it releases water when it reacts with nitronium ions. If aliphatic primary amine reacts with nitrosonium ion it Also releases water but in this case water reacts with alkyl diazonium salt and it forms alcohol while benzene diazonium salt does not react with water at this temperature.

Answer

Aromatic Primary amine will form most stable dizonium salt because it releases water when it react with nitosonium ion. if aliphatic primary amine react with nitosonium ion it Also releases water but in this case water react with alkyl dizonium salt and it form alcohol while benzene dizonium satl do not react with water at this temperature.

Answer

Option A is correct answer

Answer

Formation of Stable Diazonium Salt
A diazonium salt is formed by the reaction of primary aromatic amines with nitrous acid (HNO2) at low temperatures (273-283 K). Understanding the stability of diazonium salts is essential to predict which amine will successfully form one.
Primary Aromatic Amine
- C6H5NH2 (Aniline): This is a primary aromatic amine.
- It readily reacts with nitrous acid to form a stable diazonium salt, C6H5N2^+Cl^- (phenyl diazonium chloride), at low temperatures.
Other Options
- C6H5N(CH3)2 (Dimethylaniline): This is a tertiary amine.
- Tertiary amines do not form diazonium salts because they cannot react with nitrous acid in the same manner as primary amines.
- C2H5NH2 (Ethylamine): This is a primary aliphatic amine.
- While it can form diazonium salts, these salts are generally less stable than those formed from aromatic amines due to the absence of resonance stabilization.
- C6H5CH2NH2 (Benzylamine): This is a primary aliphatic amine.
- Similar to ethylamine, it forms diazonium salts, but they are also less stable compared to those derived from aromatic amines.
Conclusion
- The stability of diazonium salts is significantly enhanced when formed from primary aromatic amines, such as aniline.
- Therefore, the correct answer is C6H5NH2, which effectively forms a stable diazonium salt under the specified conditions.

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