$C_{2} D_{2} ? \to C_{2} D_{2} H_{2}$ (trans)
Give the best reagent for this conversion.

L i / (a q .) N H_{3}

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H_{2} / P d

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H_{2} / N i

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None of these

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Solution

The correct option is C $L i / (a q .) N H_{3}$
$L i / N H_{3}$ (liq) gives trans addition whereas luca's reagent gives cis addition. These reagents convert alkynes to alkenes and stop the further addition. Where as $H_{2} / N i$ convert alkyne to alkene and alkene to alkanes.

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