The reagent needed for converting Ph-C equiv | vedclass

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Question

(C) The reduction of an internal alkyne to a trans-alkene is achieved using dissolving metal reduction,typically with sodium or lithium in liquid ammo

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$Li / NH_3(l)$

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(C) The reduction of an internal alkyne to a trans-alkene is achieved using dissolving metal reduction,typically with sodium or lithium in liquid ammonia $(NH_3(l))$.$Ph-C \equiv C-Ph \xrightarrow{Li / NH_3(l)} 	ext{trans-}Ph-CH=CH-Ph$Catalytic hydrogenation with $H_2 / 	ext{Lindlar catalyst}$ yields the cis-alkene,while complete catalytic hydrogenation yields the alkane. $LiAlH_4$ does not reduce alkynes to alkenes.

The reagent needed for converting $Ph-C \equiv C-Ph$ to trans-stilbene is:

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