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Priyanshu kumar Best Answer
option C
explanation sir ??
Generally Mn gives [Mn2(CO)10]Fe gives [Fe(CO)5], [Fe2(CO)9], [Fe3(CO)12 ] And Co gives [Co2(CO)8 ] ,[Co4 (CO)12 ] But Cr do not gives such type of carbonyl complex.. So its won't give homoleptic polynuclear complex but yes it will give hetroleptic polynuclear complex