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Chemistry · Electronic displacement in a covalent bond: Inductive effect, electromeric effect, resonance and hyperconjugation

The correct order of decreasing acid strength of trichloroacetic acid (A), trifl

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

  • A. \( A>B>C>D \)
  • B. \( A>C>B>D \)
  • C. \( B>A>D>C \)
  • D. \( B>D>C>A \)

Step-by-step solution

Electron-withdrawing groups increase acidity. CF3 is more electronegative than CCl3, so trifluoroacetic acid (B) is strongest. Trichloroacetic acid (A) is next. Formic acid (D) has no electron-donating group, while acetic acid (C) has a methyl group which is electron-donating, making acetic acid the weakest. Thus order: B > A > D > C.
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