How would you prepare cis and trans alkene from alkyne? 

Cis and trans alkenes can be prepared from alkynes using a process called hydrogenation. Hydrogenation is the addition of hydrogen to a molecule, which results in the reduction of a double bond or a triple bond to a single bond.

To prepare cis and trans alkenes from an alkyne, the alkyne is subjected to hydrogenation in the presence of a catalyst under specific conditions. The __________ ______ _____ ___ _______ _________ ________ _________ ________.
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