1. Predict the product of the reaction?

Ni(CO)₄.

2. Upon binding to a metal center the C−O stretching frequency increases/decreases with regard to that of the free CO?

Decreases.

3. Explain why do low−valent metal centers stabilize CO binding in metal carbonyl complexes?

Because metal to ligand π−back donation.

4. Give an example of a good σ−donor and π−donor ligand?

Alkoxides (RO⁻).

Neutron diffractio