NEETChemistryAlcohols Phenols and Ethers
Match the starting materials and reagents used for the preparation of phenol (List-I) with their corresponding key intermediates (List-II). List-I List-II A. Cumene + O₂ I. Benzene sulphonic acid B. Chlorobenzene + NaOH (623 K, 300 atm) II. Cumene hydroperoxide C. Aniline + NaNO₂ + HCl (273-278 K) III. Benzene diazonium chloride D. Benzene + oleum IV. Sodium phenoxide Choose the correct answer from the options given
Options
- AA-II, B-I, C-III, D-IV
- BA-III, B-IV, C-II, D-I
- CA-II, B-IV, C-III, D-I
- DA-II, B-IV, C-I, D-III
Correct answer
C. A-II, B-IV, C-III, D-I
Step-by-step solution
A. Cumene is oxidized in the presence of air to form cumene hydroperoxide as the intermediate (A-II). B. In the Dow process, chlorobenzene is fused with NaOH at 623 K and 300 atm to form sodium phenoxide, which upon acidification yields phenol (B-IV). C. Aniline is treated with nitrous acid ( NaNO₂ + HCl) at 273-278 K to form benzene diazonium chloride, which is then warmed with water to give phenol (C-III). D. Benzene is sulphonated with oleum to form benzene sulphonic acid, which is then heated with molten NaOH t