Q29 of 312 Page 263

What would be observed on adding a 5% alkaline potassium permanganate solution drop by drop to some warm ethanol in a test-tube? Write the name of the compound formed during the chemical reaction. Also write chemical equation of the reaction which takes place.

When 5% alkaline potassium permanganate solution is added drop by drop in a test-tube containing some warm ethanol, the purple color of potassium permanganate starts disappearing. Ethanoic acid is formed in this chemical reaction.



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27 How would you convert:

(a) ethanol into ethene?


(b) propanol into propanoic acid?


Name the process in each case and write the equations of the reactions involved.

 28 Give reasons for the following observations:

(a) Air holes of a gas burner have to be adjusted when the vessels being heated get blackened by the flame.


(b) Use of synthetic detergents causes pollution of water.

 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.