The compound that is not an olefinic organometallic compound is:

Which of the following is an organometallic compound?

In which of the following complexes does the $C-O$ bond have the maximum $IR$ stretching vibrational frequency?

Give an example of synergistic bonding interaction in a carbonyl complex.

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: The metal-carbon bond in metal carbonyls possesses both $\sigma$ and $\pi$ character.
Reason $(R)$: The ligand-to-metal bond is a $\sigma$ bond and metal-to-ligand bond is a $\pi$ bond.
In the light of the above statements,choose the most appropriate answer from the options given below :

Which of the following is an organometallic compound?