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when an primay aromatic amine is treated...

when an primay aromatic amine is treated with `NaNO_(2)+HCl` at `0^(0)-5^(0)C`, a diazonium salt is formed and the reaction is called diazo reaction. In this reaction mineral acid must be added to prevent the coupling reaction of diazonium salt with excess of aryl amine. Diazonium salt is highly useful in the synthesis of number of coloured dyes.
In the given reaction

A

B

C

D

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The correct Answer is:
A
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when an primay aromatic amine is treated with NaNO_(2)+HCl at 0^(0)-5^(0)C , a diazonium salt is formed and the reaction is called diazo reaction. In this reaction mineral acid must be added to prevent the coupling reaction of diazonium salt with excess of aryl amine. Diazonium salt is highly useful in the synthesis of number of coloured dyes. When 2, 4-dinitroaniline react with NaNO_(2)+HCI at 5^(0)C followed by reaction with anisole, a coloured compound is formed which can be given as

when an primay aromatic amine is treated with NaNO_(2)+HCl at 0^(0)-5^(0)C , a diazonium salt is formed and the reaction is called diazo reaction. In this reaction mineral acid must be added to prevent the coupling reaction of diazonium salt with excess of aryl amine. Diazonium salt is highly useful in the synthesis of number of coloured dyes. For the following diazonium ion the decreasing order of reactivity of these ion in azo-coupling rcaction

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A reaction of aryl diazonium salts that does not involved loss of nitrogen takes place when they react with phenol and aromatic amines. Aryl diazonium ion relatively is weak electrophile but has sufficient reactivity to attack strongly activated aromatic ring. The reaction is known as azo coupling. The coupling of diazonium ions with phenols or other electron rich aromatic compounds is useful commercial reaction as azo compounds are highly coloured and many of them are used as dyes.