Give me answer sir

Dear student,
Please find below the answer:

Three classes of enzymes are as follows:
 

• Oxidoreductase - These enzymes catalyse the oxidation-reduction reactions.They catalyse transfer of electrons from one molecule (electron donor)  to another (electron acceptor). 

   Subclasses of this enzyme include  dehydrogenases, oxidases, oxygenases, etc. 

 NAD⁺ is electron donor and ethanol is acceptor.

 

•  Tranferases - These types of enzymes catalyse reaction that involve transfer of groups such as amino, carbonyl, carboxyl from one  molecule to another. 

 Ex- Transcarboxylases, transaminase,hexokinase, etc. etc.

 

• Hydrolases- These types of enzymes catalyze reaction that involve cleavage of bonds by adding water.

 Ex- Esterases, peptidases, etc.

 

Hope this clears your doubt.
Regards.