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The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is:

1. B > A > D > C
2. B > D > C > A
3. A > B > C > D
4. A > C > B > D

Correct answer: B > A > D > C

Solution

The acid strength depends on the electron-withdrawing effect of substituents. Trifluoroacetic acid (B) is the strongest due to the high electronegativity of fluorine, followed by trichloroacetic acid (A). Formic acid (D) is stronger than acetic acid (C) because it lacks an electron-donating methyl group.

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