This is a series of chemical reactions involving the compound ethyl chloride $C2H5Cl$.

C2H5Cl can react with water $H2O$ to form ethanol $C2H5OH$ and hydrogen chloride $HCl$:
C2H5Cl + H2O -> C2H5OH + HCl

Ethanol $C2H5OH$ can lose a hydrogen molecule $H2$ to form ethylene $C2H4$ and water $H2O$:
C2H5OH -> C2H4 + H2O

Ethylene $C2H4$ can undergo hydrogenation to form ethane $C2H6$:
C2H4 + H2 -> C2H6

Therefore, the given series of reactions can be summarized as:
C2H5Cl -> C2H5OH -> C2H4 -> C2H6