Q.
Match List I with List II
LIST I Coordination entity
LIST II Wavelength of light absorbed in nm
A
$\left[ CoCl \left( NH _3\right)_5\right]^{2+}$
I
310
B
$\left[ Co \left( NH _3\right)_6\right]^{3+}$
II
475
C
$\left[ Co ( CN )_6\right]^{3-}$
III
535
D
$\left[ Cu \left( H _2 O \right)_4\right]^{2+}$
IV
600
Choose the correct answer from the options given below:
| LIST I Coordination entity | LIST II Wavelength of light absorbed in nm | ||
|---|---|---|---|
| A | $\left[ CoCl \left( NH _3\right)_5\right]^{2+}$ | I | 310 |
| B | $\left[ Co \left( NH _3\right)_6\right]^{3+}$ | II | 475 |
| C | $\left[ Co ( CN )_6\right]^{3-}$ | III | 535 |
| D | $\left[ Cu \left( H _2 O \right)_4\right]^{2+}$ | IV | 600 |
Solution:
LIST I Coordination entity
LIST II Wavelength of light absorbed in nm
A
$\left[ CoCl \left( NH _3\right)_5\right]^{2+}$
I
535
B
$\left[ Co \left( NH _3\right)_6\right]^{3+}$
II
475
C
$\left[ Co ( CN )_6\right]^{3-}$
III
310
D
$\left[ Cu \left( H _2 O \right)_4\right]^{2+}$
IV
600
$E =\frac{ hc }{\lambda} \Rightarrow E \propto \frac{1}{\lambda}$
$\Rightarrow \Delta( CFSE ) \propto \frac{1}{\lambda_{\text {absorb }}} \propto \text { strength of ligand. }$
| LIST I Coordination entity | LIST II Wavelength of light absorbed in nm | ||
|---|---|---|---|
| A | $\left[ CoCl \left( NH _3\right)_5\right]^{2+}$ | I | 535 |
| B | $\left[ Co \left( NH _3\right)_6\right]^{3+}$ | II | 475 |
| C | $\left[ Co ( CN )_6\right]^{3-}$ | III | 310 |
| D | $\left[ Cu \left( H _2 O \right)_4\right]^{2+}$ | IV | 600 |