Identify the correct reagents required for the following transformation · ABC26OR0891
Subject: Organic Chemistry · Chapter: Reagents, Reaction Mechanisms & Named Reactions · Topic: Reagents, Reaction Mechanisms & Named Reactions – General · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Medium
Identify the correct reagents required for the following transformation 
(a)(i) $\mathrm{NaBH}_{4}$; (ii) $\mathrm{H}_{3} \mathrm{O}^{+}$
(b)(i) $\mathrm{LiAlH}_{4}$; (ii) $\mathrm{H}_{3} \mathrm{O}^{+}$
(c)(i) $\mathrm{HOCH}_{2} \mathrm{CH}_{2} \mathrm{OH}, \mathrm{H}^{+}$; (ii) $\mathrm{LiAlH}_{4}$ (iii) $\mathrm{H}_{3} \mathrm{O}^{+}$
(d)(i) $\mathrm{HSCH_2CH_2SH}$, $\mathrm{H^{+}}$; (ii) $\mathrm{LiAlH_4}$; (iii) $\mathrm{H_3O^{+}}$
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
Protect the aldehyde as an acetal (ethylene glycol/H⁺), reduce the ester with LiAlH₄, then remove the acetal with aqueous acid (c).
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