O Levels Chemistry (5070)•5070/11/O/N/23
Explanation
Correct chemical formula matching Steps:
- Examine each name-formula pair for accuracy based on standard nomenclature.
- Verify ammonia: NH3 matches the molecular formula for NH3.
- Verify ethene: C2H4 matches the molecular formula for C2H4.
- Verify methanol: CH3OH matches the structural formula for CH3OH.
- Verify propanoic acid: CH3COOH does not match; correct is CH3CH2COOH.
Why C is correct:
- Methanol's formula CH3OH accurately represents the simplest alcohol with one carbon, three hydrogens, and one hydroxyl group.
Why the others are wrong:
- A: Correct formula, but question context unclear.
- B: Correct formula, but question context unclear.
- D: Incorrect; CH3COOH is ethanoic acid, not propanoic acid (requires three carbons).
Not enough information to confirm why only C is selected over A and B.
Final answer: C
Topic: Formulae, functional groups and terminology
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