Which of the following represents correct matching order ? A. Acetic acid I.…
2019
Which of the following represents correct matching order ?
A. Acetic acid I. Curd
B. Lactic acid II. Spinach
C. Oxalic acid III. Citrus fruits
D. Ascorbic acid IV. Vinegar
- A.
A-II, B-III, C-IV, D-I
- B.
A-I, B-II, C-III, D-IV
- C.
A-IV, B-I, C-II, D-III
- D.
A-II, B-IV, C-I, D-III
Show answer & explanation
Correct answer: C
Several common organic acids are named after — or are most commonly recognised through — the natural substance in which they occur; such acid-to-source associations are a standard general-science fact commonly tested via matching-type questions.
Matching each acid named in the question to its natural source:
Acid | Natural source | Why |
|---|---|---|
Acetic acid (ethanoic acid) | Vinegar | Vinegar is essentially a dilute aqueous solution of acetic acid, produced by the fermentation of ethanol. |
Lactic acid | Curd (dahi) | Lactic-acid bacteria ferment the milk sugar lactose during curdling, and the lactic acid produced gives curd its sour taste. |
Oxalic acid | Spinach | Spinach and related leafy greens naturally contain oxalic acid, which is responsible for their mildly astringent taste. |
Ascorbic acid (Vitamin C) | Citrus fruits | Ascorbic acid is the chemical name for Vitamin C, which occurs abundantly in citrus fruits such as lemon, orange, and mausambi (sweet lime). |
This gives the matching order A-IV, B-I, C-II, D-III.
Checking the alternatives confirms this is the only consistent order: any order that pairs acetic acid with spinach, lactic acid with citrus fruits, oxalic acid with vinegar, or ascorbic acid with curd contradicts the source facts above, so no other order can be correct.