The correct order of ligands arranged in increasing field strength is:

Question

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Strategy:
 Ligand field strength increases as we move from weak-field halides to strong-field nitrogen and carbon donors in the spectrochemical series.

Step 1: Analyze halide field strength
Among halides, field strength increases as the size of the halogen atom decreases: .

Step 2: Compare with other ligands
Water and ammonia are stronger than halides. Specifically,  (N-donor) is a better -donor than  (O-donor).

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