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The mismatched combinations are A. Chlorophyll – Co B. Water hardness – EDTA C. Photography – [Ag(CN)2]− D. Wilkinson catalyst – [(Ph3P)3RhCl] E. Chelating ligand – D-Penicillamine Choose the correct answer from options given below.

1. (1) A, C and E only
2. (2) A and C only
3. (3) A and E only
4. (4) D and E only

Correct answer: (2) A and C only

Solution

Options A and C are incorrect because chlorophyll does not contain cobalt, and [Ag(CN)2]− is not directly related to photography; instead, silver halides are used in photographic processes.

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