Answer:
HI
Explanation:
The smallest molecular dipole moment among st the given option is for HI.
Perhaps, the correct order of dipole moment for the molecules given is
HI < HBr< HCl<HF.
Since, The order of electronegativity of of halogen are
F>Cl>Br>I
I has the least electronegativity hence, the pull it applies on the elcetrons of the combining atom is least and hence, the least dipole moment.
