This is the conversion of alkene to alkane , hence it includes all of the following changes:
change bond angle to 109.5o
rotation through C−C possible
change in hybridisation from sp2 to sp3
On catalytic hydrogenation ethylene gives ethane. During this reaction
hybridization of carbon atoms changes from SP2 to SP3
bond angle decreases from 120 to 109.5
C-C Bond length increases from 1.34 A° to 1.54 A°
all of these