Question

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

Answer 1

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[hint] :
Depression in freezing point to a solvent due to The dissolution of a solute in dependent on the degree of dissociation.

The depression in freezing point of a solute in water depends upon the number of particles are ions in its aqueous solution or its degree of dissociation $( \alpha )$]
These acids are arranged in the order of their increasing acidic strength

CH3COOH < CCL3COOH < CF3COOH

Fluorine is more electronegative than chlorine so trifluoroacetic acid is stronger than trichloroacetic acid which in turn stronger than Acetic Acid the order of depression in freezing point is also the same .