Question

Identify the products [A] and [B] respectively in the following reaction:

• A.
• B.
• C.
• D.

Hint:

The high temperature and pressure conditions favor the nucleophilic substitution of chlorine in chlorobenzene, leading to phenol. Oxidation with Na$_2$Cr$_2$O$_7$ then converts phenol to benzoic acid.

Answer 1

The Correct Option is C

Step 1: Reaction of Chlorobenzene with NaOH: When chlorobenzene reacts with NaOH at high temperature and pressure (300 atm, 623K), it undergoes nucleophilic substitution to form phenol (C₆H₅OH). Thus, the first product, [A], is phenol. - Step 2: Oxidation of Phenol: Phenol, when treated with chromic acid (Na₂Cr₂O₇) in an acidic medium, gets oxidized to benzoic acid (C₆H₅COOH). Thus, the second product, [B], is benzoic acid. Therefore, [A] = \text{C}-6\text{H}-5\text{OH} (Phenol) and [B] = \text{C}-6\text{H}-5\text{COOH} (Benzoic acid).