In poly nuclear metal carbonyls, the hybridisation of 'C' in terminal carbonyl is 'sp' where as that in bridged carbonyl is 'sp'^(2) II) In all mono nuclear metal carbonyl, the carbonyls are non bridged III) Fe(CO)_(5) is diamagnetic and Fe' is dsp^(3) hybridised IV) Metal carbonyls are more stable due to more nucleophilic nature of carbon monoxide The correct statements are

In poly nuclear metal carbonyls, the hybridisation of 'C' in terminal

1.	In poly nuclear metal carbonyls, the hybridisation of 'C' in terminal carbonyl is 'sp' where as that in bridged carbonyl is 'sp'^(2) II) In all mono nuclear metal carbonyl, the carbonyls are non bridged III) Fe(CO)_(5) is diamagnetic and Fe' is dsp^(3) hybridised IV) Metal carbonyls are more stable due to more nucleophilic nature of carbon monoxide The correct statements are
Answer» I, II, III I,III, IV II,III, IV I, II, III are IV Solution : .C. atoms in bridging CO molecules have `3sigmma` bonds each `(sp^(2))`. The terminal CO molecules have C atoms with `2sigma` bonds each (sp) synergic effect in METAL CARBONYLS is responsible for their stability.