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Chemistry Question on coordination compounds

The Crystal Field Stabilisation Energy (CFSE) for [CoCl6]4−[CoCl_6]^{4-} is 18000 cm−118000\, cm^{-1}. The CFSE for [CoCl4]2−[CoCl_4]^{2-} will be-

A

6000 cm−16000\, cm^{-1}

B

16000 cm−116000\, cm^{-1}

C

18000 cm−118000\, cm^{-1}

D

8000 cm−18000 \,cm^{-1}

Answer

8000 cm−18000 \,cm^{-1}

Explanation

Solution

Δtetrahedral=49×Δoctahedral\Delta_{\text{tetrahedral}} = \frac{4}{9} \times \Delta_{\text{octahedral}} =49×18000 = \frac{4}{9} \times 18000 =8000 cm−1 = 8000 \,cm^{-1}