A coordination complex [MX2L2], has a CN=4 and two unidentate ligands X and L. When the two L ligands are arranged opposite to each other in its geometry, it is called _______ isomer.(a) cis(b) trans(c) fac(d) merThe question was posed to me during an interview.This key question is from Isomerism in Coordination Compounds topic in chapter Coordination Compounds of Chemistry – Class 12

A coordination complex [MX2L2], has a CN=4 and two unidentate ligands

1.	A coordination complex [MX2L2], has a CN=4 and two unidentate ligands X and L. When the two L ligands are arranged opposite to each other in its geometry, it is called _______ isomer.(a) cis(b) trans(c) fac(d) merThe question was posed to me during an interview.This key question is from Isomerism in Coordination Compounds topic in chapter Coordination Compounds of Chemistry – Class 12
Answer» CORRECT option is (a) cis To explain I would SAY: The shape of the complex will be square planar as the CN is 4 and isomerism cannot be observed in tetrahedral shapes (also CN=4). When a PARTICULAR ligand in this type of complex is arranged opposite to each other, it is a trans isomer, else it is CALLED a cis isomer.

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