Coordination CompoundHard

Question

The wavelength of light absorbed for the following complexes are in the order.

$${\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{3 +};\left\lbrack Co\left( \underset{\text{~(II)~}}{H_{2}O} \right)_{6} \right\rbrack^{3 +};\left\lbrack Co(CN)_{6} \right\rbrack_{\text{(III)~}}^{3 -}; }{\left. \ \underset{(IV)}{Co\left( {NH}_{3} \right)_{5}\left( H_{2}O \right)} \right\rbrack^{3 +};\underset{(V)}{\left\lbrack {CoF}_{6} \right\rbrack^{3 -}} }$$(1) III $<$ I $<$ II $<$ IV $<$ V

Options

A.III $<$ I $<$ II $<$ IV $<$ V
B.III $<$ I $<$ IV $<$ V $<$ II
C.III $<$ IV $<$ I $<$ II $<$ V
D.III $<$ I $<$ IV $<$ II $<$ V

Solution

Wavelength of light absorbed increases as C.F.S.E of complex decreases.

$\left\lbrack Co(CN)_{6} \right\rbrack^{3 -}$ has maximum CFSE

$\left\lbrack {CoF}_{6} \right\rbrack^{3 -}$ has least CFSE

Ligand field strength ↑ ; C.F.S.E ↑

Correct wavelength order.

V $>$ II $>$ IV $>$ I $>$ III

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