Name the gas evolved when ethanol reacts with sodium.

29 How would you distinguish experimentally between an alcohol and a carboxylic acid on the basis of a chemical property? 30 Name the functional group of organic compounds that can be hydrogenated. With the help of a suitable example, explain the process of hydrogenation, mentioning the conditions of the reaction and any one change in physical property with the formation of the product. Name any one natural source of organic compounds that are hydrogenated. 31 What type of compound is formed when a carboxylic acid reacts with an alcohol in the presence of cone.H₂SO₄? 31 What will you observe when dilute ethanoic acid and dilute hydrochloric acid are put on universal indicator paper, one by one? What does it show?