In the coordination entity [Co(NH3)3(NO2)3], if all three N atoms

in-the-coordination-entity-co-nh3-3-no2-3-if-all-three-n-atoms

In the coordination entity [Co(NH3)3(NO2)3], if all three N atoms of the amine ligands occupy adjacent positions at the corners of an octahedral face, the geometrical isomer formed is known as _______ isomer.

A. cis

B. trans

C. fac

D. mer

I had been asked this question by my school principal while I was bunking the class.

Asked question is from Isomerism in Coordination Compounds topic in division Coordination Compounds of Chemistry – Class 12

The correct choice is C. fac

Explanation: Octahedral entities of the type [MA3B3] form two types of isomers based on whether the same ligand groups occupy adjacent positions on the octahedral face (fac) or positions around the meridian of the octahedron (mer).