15. Determine the point group of 1,4-dibromo-2,5-dichlorocyclohexane.(A)C2v(B)Ci(C)C1(D)D2d(E)Cs

20. There are three aqueous solutions of the complex ions: [Co(NH₃)₆]³⁺, [Co(CN)₆]³⁻ and [CoF₆]³⁻. The wavelengths of absorbed light for these solutions are 770 nm, 440 nm, and 290 nm. Please match the complex ion to the wavelength of absorbed light.(A)[Co(NH₃)₆]³⁺: 770 nm; [Co(CN)₆]³⁻: 440 nm; [CoF₆]³⁻: 290 nm.(B)[Co(NH₃)₆]³⁺: 440 nm; [Co(CN)₆]³⁻: 290 nm; [CoF₆]³⁻: 770 nm.(C)[Co(NH₃)₆]³⁺: 290 nm; [Co(CN)₆]³⁻: 440 nm; [CoF₆]³⁻: 770 nm.(D)[Co(NH₃)₆]³⁺: 440 nm; [Co(CN)₆]³⁻: 770 nm; [CoF₆]³⁻: 290 nm.(E)[Co(NH₃)₆]³⁺: 290 nm; [Co(CN)₆]³⁻: 770 nm; [CoF₆]³⁻: 440 nm.

15. Determine the point group of 1,4-dibromo-2,5-dichlorocyclohexane.

(A)C2v

(B)Ci

(C)C1

(D)D2d

(E)Cs

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