Question:


In the above chemical reaction, intermediate "X" and reagent/condition "A" are :

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Aniline with \(\mathrm{NaNO_2/HCl}\) at 273-278 K gives benzenediazonium chloride, which hydrolyses to phenol on warming with water.
Updated On: Nov 4, 2026
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The Correct Option is D

Solution and Explanation

Step 1: diazotisation. Aniline reacts with \(\mathrm{NaNO_2 + HCl}\) at 273-278 K to give benzenediazonium chloride, \(\mathrm{C_6H_5N_2^+Cl^-}\) (X).
Step 2: on warming with water the diazonium salt is hydrolysed and \(\mathrm{N_2}\) is lost: \(\mathrm{C_6H_5N_2^+Cl^- + H_2O \xrightarrow{\Delta} C_6H_5OH + N_2 + HCl}\).
So X is the diazonium chloride and A is \(\mathrm{H_2O/\Delta}\). A nitro compound is not formed by diazotisation, which rules out options (1) and (3).
Answer: (4) X = benzenediazonium chloride, A = \(\mathrm{H_2O/\Delta}\)
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