Write the reactions of (i) aliphatic and (ii) aromatic primary amines with nitrous acid:

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Solution

(i) Aliphatic primary amines (except methylamine) react with nitrous acid in cold condition to form unstable aliphatic diazonium salt, which decomposes to give alcohol with liberation of nitrogen gas.
The reaction of ethylamine with nitrous acid is as shown.
$C_{2} H_{5} - N H_{2} + H N O_{2} N a N O_{2} + H C l - ------- \to 273 - 278 K C_{2} H_{5} - O H + H_{2} O + N_{2} ↑$
(ii) Aromatic primary amines react with nitrous acid in cold condition to give diazonium salts.
$C_{6} H_{5} - N H_{2} + N a N O_{2} + 2 H C l 273 - 278 K - ------ \to C_{6} H_{5} - N_{2}^{+} C l^{-} + N a C l + 2 H_{2} O$

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Similar questions

Write the reactions of (i) aromatic and (ii) aliphatic primary amines with nitrous acid.

Give plausible explanation for each of the following:

(i) Why are amines less acidic than alcohols of comparable molecular masses?

(ii) Why do primary amines have higher boiling point than tertiary amines?

(iii) Why are aliphatic amines stronger bases than aromatic amines?

Some statements are given about acylation of amines with acid chloride

I. Tertiary amines do not react with acid chloride

II. This reaction is an example of a nuclophilic addition reaction

III. This reaction is carried out in the presence of pyridine

IV. Aliphatic and aromatic primary and secondary amines involve in this reaction

The correct statements is/ are

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