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Type of isomerism exhibited by compounds $[Cr(H_2O)_6]Cl_3$, $[Cr(H_2O)_5Cl]Cl_2\cdot H_2O$, $[Cr(H_2O)_4Cl_2]Cl\cdot2H_2O$ and the value of coordination number (CN) of central metal ion in all these compounds, respectively is:
A
Geometrical isomerism, CN = 2
B
Optical isomerism, CN = 4
C
Ionisation isomerism, CN = 4
D
Solvate isomerism, CN = 6
Detailed Solution
These complexes differ in the number of water molecules coordinated directly to the metal versus present as water of crystallisation outside the coordination sphere — this is solvate (hydrate) isomerism. In each case, the coordination number of the central chromium ion is 6.