What is meant by an addition reaction? Give an example (with equation) of an addition reaction of an alkene. (b) What is added to groundnut oil when it is to be converted to vanaspati ghee?

(a) What is meant by an addition reaction? Give an example (with equation) of an addition reaction of an alkene.
(b) What is added to groundnut oil when it is to be converted to vanaspati ghee?
(c) Which of the two is better for our health butter or vegetable oil? Why?

(a) The reaction in which an unsaturated hydrocarbon combines with another substance to give a single product is called an addition reaction.
Example: Ethene reacts with hydrogen when heated in the presence of nickel catalyst to form ethane:
CH2 = CH2 + H2 + Ni Catalyst + Heat → CH3 - CH3
(b) Hydrogen is added to groundnut oil when it is to be converted to vanaspati ghee.
(c) Vegetable oil is better because it has unsaturated fatty acids which are good for our health.
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