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The abnormality of HF is due to the presence of hydrogen bonding. They are covalent substances soluble in polar solvents. The bond strength of HX decreases down the group as the bonds become less polar. This property governs the reactivity of the halides.
A covalent bond is a form of chemical bonding which is characterized by the sharing of electrons between atoms. Covalent bonds are mainly formed due to the tendency of the elements to attain a completely filled outer shell, that is, attain noble gas configuration and become stable.