NEET2026ChemistryChapterActual
Identify the appropriate reagent 'X' to carry out the given chemical transformation.
Options
- AH ₂, Pd / BaSO ₄
- B(i) NaBH ₄ , (ii) H ₃ O ^+
- C(i) DIBAL-H , (ii) H ₂ O
- D(i) LiAlH ₄ , (ii) H ₂ O
Correct answer
C. (i) DIBAL-H , (ii) H ₂ O
Step-by-step solution
The given transformation involves the selective reduction of an ester group ( - COOCH ₃ ) to an aldehyde group ( - CHO ) without affecting the carbon-carbon double bond ( - CH = CH - ). Let us evaluate the given reagents: H ₂, Pd / BaSO ₄ is used for the Rosenmund reduction, which converts acid chlorides to aldehydes, but it does not reduce esters. NaBH ₄ is a mild reducing agent that reduces aldehydes and ketones to alcohols but generally does not reduce esters. LiAlH ₄ is a strong reducing agent that reduces este