As an alternative, the names "methylene", "ethylene", and "phenylene" may be used to designate (methanediyl), (ethane-1,2-diyl), and (benzenediyl), respectively. The suffix "-ylene" should not be used with the mononuclear silicon, germanium, tin, or lead parent hydrides for substituent names but is allowed for the :CH2 and :SiH2 radicals (see R-
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