Indicate the dipole moment arrow for the following molecules:
$(i)$ $HF$
$(ii)$ $CO$
$(iii)$ $Cl_2$

(N/A) The dipole moment arrow points from the less electronegative atom to the more electronegative atom.
$(i)$ $H \xrightarrow{\quad} F$ (Since $F$ is more electronegative than $H$)
$(ii)$ $C \xrightarrow{\quad} O$ (Since $O$ is more electronegative than $C$)
$(iii)$ $Cl-Cl$ (No dipole moment as both atoms have the same electronegativity,so the net dipole moment is $0$)