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Question:
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Arrange the following ligands in the order of increasing field strength.
$$
\begin{array}{ccccc}
\mathrm{H}_2 \mathrm{O} & \mathrm{CO} & \mathrm{NH}_3 & \mathrm{I}^{-} & \mathrm{F}^{-} \\
\text {I } & \text { II } & \text { III } & \text { IV } & \text { V }
\end{array}
$$
Options:
$$
\begin{array}{ccccc}
\mathrm{H}_2 \mathrm{O} & \mathrm{CO} & \mathrm{NH}_3 & \mathrm{I}^{-} & \mathrm{F}^{-} \\
\text {I } & \text { II } & \text { III } & \text { IV } & \text { V }
\end{array}
$$
Solution:
2715 Upvotes
Verified Answer
The correct answer is:
IV < V < I < III < II
According to spectrochemical series the correct order of increasing field strength of ligands is
$$
\mathrm{I}^{-} < \mathrm{F}^{-} < \mathrm{H}_2 \mathrm{O} < \mathrm{NH}_3 < \mathrm{CO} .
$$
$$
\mathrm{I}^{-} < \mathrm{F}^{-} < \mathrm{H}_2 \mathrm{O} < \mathrm{NH}_3 < \mathrm{CO} .
$$
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