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Inspite of the capacity to explain the formation of complex compounds, Werner's theory is having many defects. Some o£ the important drawbacks are enumerated here.
i. Werner's theory does not correlate electronic configuration of the central metal with the formation of the complex compounds. Now it is known that the central metals try to acquire the next inert gas structure through coordinate bond formation. Hence complexes are formed.
ii. The postulates of Werner do not offer any explanation to the colour of the complex compounds. It is appropriate at this juncture, to know how the d - d transition take place and result in the colour to the complex.
iii. Werner's theory is incapable of explaining the magnetic behaviour. We know that the magnetic property depends on the number of unpaired electrons present in the metal ion; Werner's theory is not related to electronic configuration and so this property could not be explained.
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