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Acetic acid is obtained when:

1. methyl alcohol is oxidised with potassium permanganate
2. calcium acetate is distilled in the presence of calcium formate
3. acetaldehyde is oxidised with potassium dichromate and sulphuric acid
4. glycerol is heated with sulphuric acid

Correct answer: acetaldehyde is oxidised with potassium dichromate and sulphuric acid

Solution

Acetaldehyde (ethanal) is oxidized by potassium dichromate in acidic medium to acetic acid (ethanoic acid). This is a standard aldehyde-to-carboxylic-acid oxidation, so option C is correct.

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