Question

unsaturated hydrocarbon react with hydrogen

Answer 1

Yes unsaturated hydrocarbons add oxygen in the presence of catalysts such as palladium or nickel to give saturated hydrocarbon. This reaction is called hydrogenation and is used in preparing vegetable oil using nickel catalysts.

Answer 2

Alkenes contain at least one carbon-carbon double bond. It is the presence of this double bond that makes alkenes more reactive than alkanes. ... Alkenes undergo an addition reaction with hydrogen in the presence of a catalyst to form a saturated compound. Ethene does not react with hydrogen under normal conditions.