The most suitable reagent for the following transformation is · ABC26OR0599
Subject: Organic Chemistry · Chapter: Reagents, Reaction Mechanisms & Named Reactions · Topic: Reagents, Reaction Mechanisms & Named Reactions – General · Exam: GATE 2000-2022 · Marks: 2 · Difficulty: Easy
The most suitable reagent for the following transformation is 
(a)Li / Liq. $\mathrm{NH_3}$
(b)$\mathrm{PtO_2}$ / $\mathrm{H_2}$
(c)$\mathrm{LiAlH_4}$
(d)$\mathrm{B_2H_6}$
Answer
Answer: A ✓ checked by 4AB · confidence medium
Explanation
Dissolving-metal reduction (Li/liq. NH₃) reduces the conjugated C=C of the enone selectively. It leaves the isolated trisubstituted alkene alone, and the ketone survives after workup (a).
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