1) what is alkene hydrogenation ? An alkene addition reaction is a process called hydrogenation . In a hydrogenation reaction two hydrogen atom are added across the double bond of an alkene resulting in a saturated alkene . The heat released is called heat of hydrogenation . 2) what is wilkinson's catalyst ? First effect homogenious catalyst is a square planner 16 electron d8 complex chlorotris (triphenyl phosphine ) rhodium(1) called wilkinson's catalyst . 3) what do you understand by Tolman catalytic loops ? A reaction involving a true catalyst can always be represented by a closed loop is called Tolman catalytic loops. 4)Explain the term hydroformylation ? Hydroformylation also called a oxoprocess or oxo synthesis It is an industrial process to prepare aldehyde from alkanes . In this process there is a net addition of formyl group(-CHO) and a hydrogen atom to a C = C double bond . This process is considered as very impo