Question

Which chlorine among HCL, HCLO3 is more electronegative . Explain how to do this type of question

Answer 1

From the dipole moment data we find that Dipole moment of HCl (1.03D) is more than that of HClO​3 (0.66D). Thus we can infer that the HCl is more polar than HClO3 and electronegativity difference is more in HCl . In HClO3 the Cl is bonded to O atom and electronegativity difference is less hence Cl is more elaectronegative in HCl.