Answer
As the electronegativity difference between the H and halide increases, the polarity of the Hydrogen-Halide bond increases, and as a result, the dipole moment of the molecule increases. Electronegativity decreases down the group from F to I. Therefore, the polarity of the bond decreases from HF to HI.
Work Step by Step
As the electronegativity difference between the H and halide increases, the polarity of the Hydrogen-Halide bond increases, and as a result, the dipole moment of the molecule increases. Electronegativity decreases down the group from F to I. Therefore, the polarity of the bond decreases from HF to HI.
