Answer:
Fluorine, being the most electronegative,
has the strongest electron withdrawing inductive effect (-I effect). Consequently,
trifluoroacetic acid is the strongest acid while acetic acid is the weakest
acid. Hence, trifluoroacetic acid ionizes most while acetic acid ionizes least.
More the number of ions produced, more is the depression in freezing point.
Thus, the depression in freezing point is maximum for the trifluoroacetic acid
and minimum for acetic acid.
The depression in freezing points are in
the order:
Acetic acid < trichloroacetic acid <
trifluoracetic acid.
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