Question:medium

(i) Write two postulates of Werner's coordination theory. 
(ii) Draw the geometrical isomers of [(NH_3)_3(NO_2)_3] and give their structures.

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Key Points: Werner explained coordination compounds using primary and secondary valencies. Octahedral complexes of type \(MA_3B_3\) show two geometrical isomers: fac (facial) and mer (meridional). fac → three identical ligands on one face; mer → arranged along a meridian.
Updated On: Mar 11, 2026
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The Correct Option is A

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