Question

Which of following organometallic compound is \(\sigma\) and \(\pi\) bonded 

• A. [Fe(η⁵ – C₅H₅)₂]
• B. K[PtCl₃(η²– C₂H₄)]
• C. [Co(CO)₅NH₃]⁺²
• D. Fe(CH₃)₃

Answer 1

The Correct Option is C

The correct option is(C): [Co(CO)₅NH₃]⁺².

\(\sigma\) Bonds: In this complex, the bond between the cobalt atom (Co) and the ammonia molecule (NH₃) is a \(\sigma\) (sigma) bond. Sigma bonds are formed by the head-on overlap of atomic orbitals. 

\(\pi\) Bonds: The five carbon monoxide (CO) ligands in the complex are bonded to the cobalt atom via \(\pi\) (pi) bonds. Pi bonds result from the side-to-side overlap of p orbitals. Each CO ligand contributes one π bond to the complex, and since there are five CO ligands, there are a total of five \(\pi\)bonds. 

So, [Co(CO)₅NH₃]⁺² contains both \(\sigma\) and \(\pi\) bonds,