Give the diazotisation reaction of aniline. Also give the chemical reaction involved in the preparation of red azo dye and light yellow azo dye.

Benzenediazonium chloride is prepared by the reaction of aniline with nitrous acid at 273 - 278 K . Nitrous acid is produced in the reaction mixture by the reaction of sodium nitrite with hydrochloric acid. The conversion of primary aromatic amines into diazonium salts is known as diazotisation. C 6 H 5 NH 2 + NaNO 2 + 2 HCl → 273 - 278 K C 6 H 5 N + 2 Cl - + 2 H 2 O Benzene diazonium chloride reacts with phenol in which the phenol molecule at its para position is coupled with the diazonium salt to form p-hydroxyazobenzene. It is an intense orange-red coloured dye. Benzene diazonium chloride reacts with phenol in which the phenol molecule at its para position is coupled with the diazonium salt to form p-aminoazobenzene. It is a yellow coloured dye.

Write the reaction of aniline and ethanamine with nitrous acid.

Aliphatic primary amine like ethanamine reacts with nitrous acid to form ethyl alcohol with the liberation of nitrogen gas. CH 3 CH 2 NH 2 + HNO 2 → 0 - 5 ° C CH 3 CH 2 OH + H 2 O + N 2 Aromatic primary amine like aniline reacts with nitrous acid in the presence of hydrochloric acid to form diazonium salt. It is called diazotisation reaction.

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Give the correct order of proportion of products obtained by nitration of aniline.

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