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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 > D > C > A

Solution

Trifluoroacetic acid is the strongest acid, followed by trichloroacetic acid, formic acid, and acetic acid.

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