State the $IUPAC$ name of the following complex: $Fe(C_5H_5)_2$.

$CH_3MgI$ is an organometallic compound due to

Which of the following is an organometallic compound?

What is the oxidation state of $Ti$ in the Ziegler-Natta catalyst?

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 :

The solution of $TiCl_4$ and trialkylaluminium used as a catalyst in the polymerization of olefins is known as.....