MCQ practice · SSC Chemistry Board questions · Chapter 11: Mineral Resources: Fossils
CH₃CHO + [O] →(K₂Cr₂O₇ + H₂SO₄) 'Z'; here compound 'Z':
- i. contains the -COOH group
- ii. is used to make vinegar
- iii. ionises completely in aqueous solution
Think it through first, then pick an option.
- a i and ii
- b ii and iii
- c i and iii
- d i, ii and iii
Answer and explanation
Correct answer: a i and ii
Z is ethanoic acid: it has -COOH and its 4-10% solution is vinegar; but it is a weak acid and does not ionise completely.
Why the other options are wrong
- b ii and iii: iii is wrong: fatty acids ionise only slightly in water, not completely; the answer is i and ii.
- c i and iii: iii is wrong and ii is left out: Z is used to make vinegar; the answer is i and ii.
- d i, ii and iii: iii is wrong: Z is a weak acid that ionises slightly; so not all three.
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