Chemical name of HCl is hydrogen chloride but not hydrogen monochloride.Why?

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We call it as the hydrogen chloride because of the nature of the compound. "Mono" nomenclature is used when the compound contains atoms which are covalently bonded to each other. For example CO is called as carbon monoxide, CO2 is Carbon dioxide. C-O bond is a covalent bond whereas H-Cl bond is ionic bond. Another example is PCl3 which is called Phosphorus trichloride. 

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