Question

(a) What happens when ethanol is oxidised with alkaline potassium permanganate (or acidified potassium dichromate) ? Write the equation of the reaction involved.
(b) Choose those compounds from the following which can turn blue litmus solution red :
HCHO, CH3COOH, CH3OH, C2H5OH, HCOOH, CH3CHO Give reasons for your choice.

Lakhmir Singh Chemistry Class 10

Answer 1

Answer:

1 is both reagents can acts as oxidising agent.

2.only acids can change the color of litmus from blue to red.

Answer 2

Explanation:

(a) When ethanol is oxidised with alkaline potassium permanganate or acidified potassium dichromate, it also gets oxidised and forms ethanoic acid.

When alkaline permanganate is added to ethanol, the pink colour of potassium permanganate disappears, as it gets used up for the oxidation process.

(b) Both CH3COOH and HCOOH can turn the blue litmus solution red as they are the organic acids.