MCQ practice · SSC Chemistry Board questions · Chapter 11: Mineral Resources: Fossils
What forms when the reactant in the stem is oxidised by acidified potassium dichromate?
Think it through first, then pick an option.
- a alkane
- b ketone
- c ester
- d organic acid
Answer and explanation
Correct answer: d organic acid
With a strong oxidant ethanol becomes ethanal, then ethanoic acid (an organic acid).
Why the other options are wrong
- a alkane: Oxidation adds oxygen and never gives an alkane; oxidising ethanol ends in an organic acid.
- b ketone: The book says aldehyde/ketone first, then organic acid; ethanol ends as an organic acid.
- c ester: Oxidation does not make an ester; acidified K₂Cr₂O₇ oxidises ethanol to an organic acid.
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