The reagent needed for converting
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- Cat. Hydrogenation
- \(\mathrm{H_2}\) /Lindlar Cat.
- Li/\(\mathrm{NH_3}\)
- \(\mathrm{LiAlH_4}\)
The Correct Option is C
Solution and Explanation
Catalytic hydrogenation gives the alkane (over-reduction); \(\mathrm{H_2}\)/Lindlar catalyst gives syn addition and the cis-alkene; \(\mathrm{LiAlH_4}\) does not reduce an isolated C-C triple bond.
Dissolving metal reduction (Li or Na in liquid \(\mathrm{NH_3}\)) proceeds via a trans vinyl radical/anion and gives the trans-alkene.
Answer: (3) Li/NH3
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