What is added to groundnut oil when it is to be converted to vanaspati ghee?

44 Name a chemical reaction which is characteristic of unsaturated hydrocarbons (like alkenes and alkynes). 45 What is meant by an addition reaction? Give an example (with equation) of an addition reaction of an alkene. 45 Which of the two is better for our health: butter or vegetable oil? Why? 46 When ethanoic acid reacts with sodium hydrogencarbonate, then a salt X is formed and a gas Y is evolved. Name the salt X and gas Y. Describe an activity with the help of a labelled diagram of the apparatus used to prove that the evolved gas is the one which you have named. Also write the chemical equation of the reaction involved.