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Question: Answered & Verified by Expert
Among the following, the coloured compound is
ChemistryCoordination CompoundsJEE Main
Options:
  • A
    $\mathrm{CuCl}$
  • B
    $\mathrm{K}_3\left[\mathrm{Cu}(\mathrm{CN})_4\right]$
  • C
    $\mathrm{CuF}_2$
  • D
    $\left[\mathrm{Cu}\left(\mathrm{CH}_3 \mathrm{CN}_4\right)\right] \mathrm{BF}_4$
Solution:
1233 Upvotes Verified Answer
The correct answer is:
$\mathrm{CuF}_2$
In $\mathrm{CuF}_2, \mathrm{Cu}^{2+}$ ions exist, having $d^9$-configuration. Unpaired electron causes colour ( $d-d$ transition)
In the crystalline form, $\mathrm{CuF}_2$ is blue coloured

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