Which of the following compounds show colour due to $d-d$ transition?

  • [JEE MAIN 2024]
  • A

    $\mathrm{CuSO}_4 .5 \mathrm{H}_2 \mathrm{O}$

  • B

    $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$

  • C

    $\mathrm{K}_2 \mathrm{CrO}_4$

  • D

    $\mathrm{KMnO}_4$

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