Question:

Consider the above reaction sequence. Identify the component A and component B :

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Benzenediazonium chloride is reduced to benzene by ethanol (H3PO2/CH3CH2OH); benzene is sulphonated with oleum, fused with NaOH and acidified to give phenol.
Updated On: Oct 31, 2026
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The Correct Option is B

Solution and Explanation

Step 1: A + CH3CH2OH \(\to\) benzene. Ethanol reduces a diazonium salt (replacing N2+ by H, giving N2 + CH3CHO + HCl), so A = C6H5N2+Cl\(-\).
Step 2: Benzene + H2SO4 (oleum), heat \(\to\) benzenesulphonic acid.
Step 3: NaOH converts it (alkali fusion) to sodium phenoxide, and HCl then liberates phenol, so B = C6H5OH.
Answer: (B) A = C6H5N2+Cl\(-\), B = phenol
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