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Addition of hydrogen atomintounsaturated compoundsis known as hydrogenationWhen hydrogen is added into unsaturated compounds like alkenes and alkynes ; double bond of alkene and triple bond of alkynes vanishes and hydrogen is added to them to make themsaturated compounds.When hydrogen is added to cis-2-pentene the product will be pentane.catalyst used in the process of hydrogenation is platinum ,palladium or nickel.Catalystis required to carry out this reaction if catalyst id not used than this reaction will carried at very high temperature.Raney-nickelcatalyzed hydrogenations require high pressure.To look more abouthydrogenationclick herebrainly.com/question/11837837#SPJ4...