Among the hydrogen halides, the most polar bond is present in

A $HI$
B $HBr$
C $HF$
D $HCl$

Answer: C

Bond polarity increases with the electronegativity difference between the bonded atoms. Fluorine is the most electronegative halogen (3.98 against 2.20 for H), so the H-F bond has the largest difference and is the most polar.

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