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  1. [Ti(H2O)6]3+
  2. [CoF6]3+
  3. [CrO4]2−
  4. [Cu(NH3)4]2+
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Answer: Option 3

The colour of transition-metal compounds is normally associated with d-d transitions. However, some transition metal compounds show intense colour in solution in spite of absence of d-electrons. For example, the orange colour of TiBr4, yellow colour of CrO42-, orange colour of Cr2O27-, intense red colour of [Fe(SCN)4] and deep purple of MnO4 are not due to d—d transitions. In the case of MnO4 ion, the color is due to charge transfer and not due to d-d transitions.

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