What happens when hydrogen (H₂) is added to an alkene in the presence of a catalyst?
Alkene converts into an alkane
Alkenes have a carbon-carbon double bond.
In the presence of a catalyst such as nickel, hydrogen adds across this double bond (hydrogenation), turning the alkene into a saturated alkane, e.g. C2H4 + H2 → C2H6.
This is an addition reaction, not substitution.
Hence, the answer is that the alkene converts into an alkane.
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