Answer:
(a) Hydrogenation
reaction the addition of hydrogen to the unsaturated molecule to make it
saturated is known as hydrogenation.
e.g.,
(b)
Oxidation reaction The reactions in which an oxidizing agent supply nascent
oxygen for oxidation are called oxidation reactions.
e.g.,
(c)
Substitution reaction When one atom or a group of atoms replaces or
substitutes another atom or a group of atoms from the molecule, it is known as
substitution reaction-
e.g.,
(d)
Saponification reaction When esters are hydrolyzed in the presence of a
base (NaOH) then the reaction is called Saponification reaction.
e.g.,
(e)
Combustion reaction Organic compounds burn readily in air to form 
and
water vapour along with lot of heat. This is known as combustion reaction.
e.g.,
Energy
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