The Wilkinson catalyst is

Select the correct statement about the anionic part of Zeise's salt,$K[Pt(\eta^2 - C_2H_4)Cl_3]$.

Which of the following does not have a metal-carbon bond?

Which of the following metals does not form a polynuclear carbonyl?

Which of the following statements is incorrect?
$(1)$ $Al_4C_3$ is an organometallic compound.
$(2)$ Metal carbonyls are organometallic compounds.
$(3)$ $TEL$ (Tetraethyl lead) is a $\pi$-bonded organometallic compound.
$(4)$ Frankland reagent is a $\sigma$-bonded organometallic compound.

Among the following,which is not the $\pi$-bonded organometallic compound?