1.

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

Answer»

Solution :Aromatic primary amines REACTS with `HNO_(2)` at 273-278 K to form aromatic DIAZONIUM salts.

Aliphatic primary amines also react with `HNO_(2)` at 273-278 K to form aliphatic diazonium salts. But these are unstable even at this low TEMPERATURE and thus decompose readily to form a MIXTURE of compounds consisting of alkyl chlorides, alkenes and ALCOHOLS, out of this alcohols generally predominate.
`underset("Ethylamine")(CH_(3)CH_(2)NH_(2))+HNO_(2)+HCl underset((-2H_(2)O))overset(273-278K)to underset("Ethanediazonium chloride (unstable)")([CH_(3)CH_(2)-overset(+)(N)-=N]Cl^(-)) overset(H_(2)O)to underset("Ethanol")(CH_(3)CH_(2)OH)+N_(2)+HCl`


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