An unsaturated hydrocarbon having two carbon atoms was made to react with two moles of hydrogen gas in the presence of a catalyst to give a saturated…

An unsaturated hydrocarbon having two carbon atoms was made to react with two moles of hydrogen gas in the presence of a catalyst to give a saturated hydrocarbon. Using the above information, answer the following questions:

(a) The type of reaction that occurred is ............... . (addition / substitution)

(b) Name a suitable catalyst which is used in the reaction.

(c) Write a balanced chemical equation for the above reaction.