1. Tardigrade
  2. Question
  3. Chemistry
  4. Assertion CO and CN are referred as π acid ligands. Reason In CO and CN vacant π type orbitals are present.

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Q. Assertion CO and CN are referred as $\pi$ acid ligands.
Reason In CO and CN vacant $\pi$ type orbitals are present.

Coordination Compounds

Solution:

The ligands having vacant $\pi$-type orbitais have a tendency to receive back donated $\pi$ electrons, thus these are called $\pi$-acid ligands or $\pi$ acceptor ligands, e.g., CO and NO have Ione pair as well as $\pi$ or $\pi^*$ orbitais which take part in the formation of $\pi$-bond with central metaI atom as observed in case of carbonyls.