JEE Main202623 January 2026Morning ShiftChemistryAlcohols Phenols and EthersActual
The correct sequence of reagents for the above conversion of X to Y is :
Options
- A(i) ( NaOH ( aq ) ); (ii) Jones reagent; (iii) ( H ₃ O ⁺ )
- B(i) ( B ₂ H ₆ / H ₂ O ₂ ); (ii) NaOEt; (iii) Jones reagent
- C(i) Jones reagent; (ii) NaOEt; (iii) ( Hot KMnO ₄ / KOH )
- D(i) NaOEt; (ii) ( B ₂ H ₆ / H ₂ O ₂ ); (iii) Jones reagent
Correct answer
D. (i) NaOEt; (ii) ( B ₂ H ₆ / H ₂ O ₂ ); (iii) Jones reagent
Step-by-step solution
The transformation of (X) benzene with Br and CH₃ substituents to (Y) benzene with CH₂COOH requires: First, NaOEt causes elimination of HBr to form an alkene intermediate. Second, B₂H₆/H₂O₂ performs hydroboration-oxidation, adding hydroxyl group in anti-Markovnikov fashion to yield a primary alcohol. Third, Jones reagent oxidizes the primary alcohol to carboxylic acid. The sequence NaOEt → B₂H₆/H₂O₂ → Jones reagent produces the desired carboxylic acid product.