(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.

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Solution

(a) When ethanol is oxidised with alkaline potassium permanganate (alkaline KMnO₄) or acidified potassium dichromate (acidified K₂Cr₂O₇), ethanoic acid is formed. Alkaline potassium permanganate and acidified potassium dichromate are strong oxidising agents, as they provide oxygen for oxidising other substances in the reaction. This reaction is known as the oxidation reaction.

The chemical equation for the above reaction is as follows:
CH₃CH₂OH + 2[O] → CH₃COOH + H₂O

(b) CH₃COOH (ethanoic acid) and HCOOH (formic acid) are the compounds which can turn blue litmus solution red. This happens because ethanoic acid and formic acid are the organic compounds which are acidic in nature.

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Similar questions

(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 :
$H C H O, C H_{3} C O O H, C H_{3} O H, C_{2} H_{5} O H, H C O O H, C H_{3} C H O$
Give reasons for your choice.

What happens when (Give equations of the chemical reaction)
(i) A pinch of sodium hydrogencarbonate is added to ethanoic acid.
(ii) Ethanol is oxidised with acidified potassium dichromate.

What happens when: (Write chemical reactions as well)
(i) A pinch of sodium hydrogen carbonate is added to ethanoic acid.
(ii) Ethanol is oxidised with acidified potassium dichromate.

(a) In organic compounds, which part largely determines the physical and chemical properties.
(b) Write chemical equation to represent the reaction of ethanol with acidified solution of potassium dichromate.

Name the products formed and give appropriate chemical equations for the following :
(a) Sodium reacting with ethyl alcohol.
(b) Ethanol oxidised by acidified potassium dichromate.

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