Given below are two statements
Statement I:
Primary aliphatic amines react with $H N O_{2}$ to give unstable diazonium salts.
Statement II:
Primary aromatic amines react with $H N O_{2}$ to form diazonium salts which are stable even above $300 K$ . 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.
Statement I is correct but Statement II is incorrect.
Both Statement I and Statement II are correct
Both Statement I and Statement II are incorrect.

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Solution

The correct option is B Statement I is correct but Statement II is incorrect.

Primary aliphatic amines form highly unstable alkanediazonium salts. They rapidly decompose even at temperatures < (273 K) forming carbocations and nitrogen gas.

Primary aromatic amines form arenediazonium salts,which are stable for a short time in solution at lower temperatures (273-278K).

The aromatic diazonium salts are unstable above $300 K$ .

Hence, Statement-I is correct & statement II is incorrect.

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Similar questions

Account for the following

(i) $p K_{b}$ of aniline is more than that of methyl amine.

(ii) Ethylamine is soluble in water whereas aniline is not

(iii) Methyl amine in water reacts with ferric chloride to precipitate hydrated ferric oxide

(iv) Although amino group is o- and p- directing in aromatic electrophilic substitution, aniline on nitration gives a substantial amount of m-nitroaniline

(v) Aniline does not undergo Friedel Crafts reaction

(vi) Diazonium salts of aromatic amines are more stable than those of aliphatic amines

(vii) Gabriel phthalimide synthesis is preferred for synthesising primary amines

Account for the following:

(i) pK_bof aniline is more than that of methylamine.

(ii) Ethylamine is soluble in water whereas aniline is not.

(iii) Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.

(iv) Although amino group is o, p− directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m-nitroaniline.

(v) Aniline does not undergo Friedel-Crafts reaction.

(vi) Diazonium salts of aromatic amines are more stable than those of aliphatic amines.

(vii) Gabriel phthalimide synthesis is preferred for synthesising primary amines.

Assertion (A): Both aromatic and aliphatic primary amines produce stable diazonium salts on diazotization

Reason (R): Aromatic diazonium salt exhibit resonance

Account for the following: Diazonium salts of aromatic amines are more stable than those of aliphatic amines?

Q. Diazonium salts of aliphatic amines are more stable than those of aromatic amines.
If this is true enter 1, if false enter 0.

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