(C) The polarity of a bond depends on the difference in electronegativity between the bonded atoms.Electronegativity values are: $F = 4.0$,$Cl = 3.0$,

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(C) The polarity of a bond depends on the difference in electronegativity between the bonded atoms.Electronegativity values are: $F = 4.0$,$Cl = 3.0$,$Br = 2.8$,$I = 2.5$.The electronegativity difference is maximum for the $I - F$ bond $(4.0 - 2.5 = 1.5)$.Therefore,the $I - F$ bond is the most polar.