Question

Which of the following acts as a ligand but does not possess any unshared pair of electrons?

• A. $C_2{H}_4$
• B. $N{H}_3$
• C. $en$
• D. $C{N}^{-}$

Answer 1

Answer: (A)

$C_2{H}_4$

Ethene acts as a ligand because of double bond between the two carbon atoms.

In other ligands, the $N$ has lone pair of electron to donate and $en$ means ethylenediamine also has $N$ which has lone pair.

Option A is correct.