Which one of the following statements is not correct?
- ANickel forms $Ni(CO)_4$
- BAll the transition metals form monometallic carbonyls
- CCarbonyls are formed by transition metals
- DTransition metals form complexes
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Reason : There is delocalisation of electrons from filled $d$ orbitals into the empty $\pi^*$ orbitals on the $CO$ ligands.
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