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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.
(Ï and Ï bonds), covalent chemical bonds characterized by a definite but varying spatial symmetry in the distribution of electron density. A covalent bond is formed as a result of the sharing of electrons between interacting atoms. The resultant electron cloud of the Ï bond is symmetrical about the line of the bond, that is, the line connecting the nuclei of the interacting atoms (Figure l,a). Single bonds in chemical compounds are usually Ï bonds.