Question

Which of the following Vaska’s compounds?
(A) $ [Ni(PP{h_3})C{l_2}] $
(B) $ {[Rh{(CO)_2}Cl]_2} $
(C) Trans $ IrCl(CO){(PP{h_3})_2} $
(D) $ IrCl{(CO)_2}{(PP{H_3})_2} $

Answer 1

Hint: To answer this question, we first need to understand what is compound. A chemical compound is a substance made up of numerous identical molecules bound together by chemical bonds and made up of atoms from different elements. As a result, a molecule made up of only one element's atoms is not a compound.

Complete answer:
Vaska's compound -
The chemical compound trans-carbonyl chloro bis(triphenylphosphine)iridium is known as Vaska's complex (I). A centre iridium atom is coupled to two mutually trans triphenylphosphine ligands, carbon monoxide, and a chloride ion in this square planar diamagnetic organometallic complex. J. W. DiLuzio and Lauri Vaska were the first to report the complex in 1961. Vaska's complex is famous for its ability to attach to oxygen reversibly and undertake oxidative addition. It's a crystalline solid that's bright yellow in colour.
Because the reactions create distinct alterations in the stretching frequency of the coordinated carbon monoxide, infrared spectroscopy can be utilised to analyse the products of oxidative addition to Vaska's complex. The degree of -back bonding enabled by the newly connected ligands determines these alterations. In the literature, the CO stretching frequencies for Vaska's complex and oxidatively added ligands have been observed.
So we conclude that $ IrCl{(CO)_2}{(PP{H_3})_2} $ is the vaska’s compound .
So the final answer is option (D) i.e. $ IrCl{(CO)_2}{(PP{H_3})_2} $ .

Note:
A mixture is a composition made up of two or more distinct components that have not been chemically mixed in chemistry. A mixture is a physical mixing of two or more substances that retain their identities and are blended in the form of solutions, suspensions, or colloids.