Question

Choose the correct option(s) regarding synergic bond:​

• A. It is formed by the back donation of ​a metal atom/ion to the ligand.
• B. The internal bond length of a ligand and the metal-ligand bond length does not vary due to the synergic bonding.
• C. It is a $\sigma$-bond formed between a metal atom/ion and a ligand.
• D. All of the above.

Answer 1

The correct option is A It is formed by the back donation of ​a metal atom/ion to the ligand.

Synergic Bond​:
The $pi$-bond formed between a metal atom/ion and a ligand by back donation of​ a metal atom/ion is known as a synergic bond.​
The internal bond length of a ligand and the metal-ligand bond length varies due to the synergic bonding, and this effect is known as synergic effect.​
Synergic effect is due to a self-strengthening bond, which involves transference of electrons from​

1. Ligand to metal​
2. Metal’s filled orbitals to​ vacant orbitals of ligand​