1. Predict the product of the reaction.

2. Identify which molecular orbitals of a butadiene moiety engage in π−interaction with a suitable d orbital of a metal in a η⁴−metal allyl complex?

Ψ₃.

3. Mention the type of orientations displayed by butadiene ligands for binding to metal.

Cisoid (common) and transoid (rare).

4. Comment on the number of π−electrons present in the cyclobutadiene moiety of a metal cyclobutadiene complex.

6 π−electrons.