Firstly, when compound ‘A’ reacts with benzenesulphonyl chloride, it gives a compound which is soluble in alkali. That means the compound is a primary amine. ‘A’ is given as C6H7N or C6H5NH2.
Compound ‘A’ is C6H5NH2 or aniline if it is a primary amine, which can be proven in the following reactions. Aniline is sparingly soluble in water.
Since aniline is basic, on reaction with mineral acid like HCl, it gives compound ‘B’ which is anilium chloride which is a salt and is soluble in water.
When aniline reacts with chloroform, CHCl3 and alcoholic potash, KOH, it forms benzene isonitrile or compound ‘C’ which has an obnoxious smell.
As mentioned above, aniline reacts with benzenesulphonyl chloride to give compound ‘D’ or N-phenylbenzenesulphonamide which is soluble in alkali.
When aniline reacts with NaNO2 and HCl, it forms diazonium salt ie. benzene diazonium chloride, which on reaction with phenol in alkaline conditions gives an orange dye ‘F’ which is p-hydroxyazobenzone.
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