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Chemistry · PYQ NEET UG 2025

हिन्दी

Identify the suitable reagent for the following conversion. \( \begin{array}{c} \text{O} \\ \parallel \\ \text{C-OCH}_3 \end{array} \longrightarrow \text{CHO} \)

Question diagram
  1. A
    (i) \( \text{LiAlH}_4 \), (ii) \( \text{H}^+/\text{H}_2\text{O} \)
  2. B
    (i) \( \text{AlH(iBu)}_2 \) (ii) \( \text{H}_2\text{O} \)
  3. C
    (i) \( \text{NaBH}_4 \), (ii) \( \text{H}^+/\text{H}_2\text{O} \)
  4. D
    \( \text{H}_2 / \text{Pd-BaSO}_4 \)
View Answer & Solution

Correct answer · Option B

(i) \( \text{AlH(iBu)}_2 \) (ii) \( \text{H}_2\text{O} \)

Explanation

DIBAL-H (Diisobutylaluminium hydride, \( \text{AlH(iBu)}_2 \)) selectively reduces esters (\( -\text{COOCH}_3 \)) to aldehydes (\( -\text{CHO} \)) at low temperatures followed by hydrolysis.
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