Question

How many $\pi$ electrons are donated by $C_5{H}_5^{-}$ ligand?

• A. 2
• B. 4
• C. 5
• D. 6

Answer 1

The correct option is C 5

In ${C_5{H}_5}^{-}$ ligand, all the $5$ carbon atoms are bound to the metal via the overlapping of the $\pi$ molecular orbittals of ${C_5{H}_5}^{-}$ with the $s,$, $p$, and/or $d$ orbittals of the metal. Hence, it donates $5$ electrons in total