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14/02/2022 5:48 pm
Topic starter
The reagent needed for converting
Ph - C = C -Ph → \(^{Ph}_H>C<_{Ph}^H\)
(a) Cat. Hydrogenation
(b) H2/Lindlar Cat.
(c) Li/NH3
(d) LiAlH4
1 Answer
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14/02/2022 5:52 pm
Correct answer: (c) Li/NH3
Explanation:
With Lithium in liquid ammonia, trans-alkene is almost an exclusive product.
Ph - C ≡ C - Ph \(\overset{Li \ in \ liq. \ NH_3}{\underset{Birch \ reduction}\longrightarrow}\) \(^{Ph}_H>C = C <_{Ph}^H\)