Which molecule has polar bonding and is nonpolar? hcl, of2, sf6, hcn, chf3

SF6

Reason:
Fluorine is more electronegative than sulfur, so the bond dipoles point toward fluorine. However, all the six S-F bonds are arranged octahedrally around the central sulfur.

Because the octahedral geometry is symmetrical, the bond dipoles cancel each other, and the molecule is nonpolar, meaning that µ = 0.