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How do you obtain an alkene from alkyne?...

How do you obtain an alkene from alkyne?

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Alkynes react with hydrogen in the presence of (Palladium supported over calcium carbonante and deactivated with quinoline ) Lindlar's catalyst, to give alkene.
`R - C equiv CH + H_(2) underset("Quinoline")overset(PdlCaCO_(3))(rarr)R - CH = CH_(2)`
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