Coordination CompoundHard

Question

Given below are two statements :

Statement I: $\left\lbrack {CoBr}_{4} \right\rbrack^{2 -}$ ion will absorb light of lower energy than $\left\lbrack {CoCl}_{4} \right\rbrack^{2 -}$ ion.

Statement II : In $\left\lbrack {CoI}_{4} \right\rbrack^{2 -}$ ion, the energy separation between the two set of d-orbitals is more than $\left\lbrack {CoCl}_{4} \right\rbrack^{2 -}$ ion.

In the light of the above statements, choose the correct answer from the options given below :

Options

A.Both Statement I and Statement II are false
B.Statement I is true but Statement II is false
C.Statement I is false but Statement II is true
D.Both Statement I and Statement II are true

Solution

Statement 1 (True)

Strength of ligand : ${Cl}^{-} > {Br}^{-}$

$${\Delta_{t}:\left\lbrack {CoCl}_{4} \right\rbrack^{2 -} > \left\lbrack {CoBr}_{4} \right\rbrack^{2 -} }{E_{\text{absorbed~}}:\left\lbrack {CoCl}_{4} \right\rbrack^{2 -} > \left\lbrack {CoBr}_{4} \right\rbrack^{2 -} }$$Statement 2 (False)

Strength of ligand : $I^{-} < {Cl}^{-}$

$$\Delta_{t}:\left\lbrack {CoI}_{4} \right\rbrack^{2 -} < \left\lbrack {CoCl}_{4} \right\rbrack^{2 -}$$

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