(Answer) (c) Dipole-dipole forces
HCl is a polar covalent compound in which dipoles are created in each HCl molecule due to unequal share of electrons between H atom and Cl atom because Cl is more electronegative than hydrogen and attracts the electron pair more as compared to hydrogen . Dipoles of each HCl molecule interact with another HCl molecule by an inter molecular force known as dipole-dipole force.
