MEDIUMMCQ SINGLENEET ChemistryInorganic ChemistryCoordination compoundsPrevious Year Questions
Assertion: CO and CN are referred as acid ligands. Reasaon: In CO and CN vacant type orbitals are present. [AIIMS 2009]
A.Both Assertion and Reason are true and Reason is✓ Correct
B.Both Assertion and Reason are true but Reason is
C.Assertion is true but Reason is false.
D.Both Assertion and Reason are false.
Explanation
The ligands having vacant pi type orbitals have a tendency to receive back donated pi electrons. So, these are called pi-acid ligands or pi acceptor ligands, e.g. CO and CN have lone pair as well as bonding and antibonding molecular orbitals which take part in the formation of pi bond with the central metal atom as observed in case of carbonyls. Hence, the correct option is (a).
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