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Among the following species the one which causes the highest CFSE, $\Delta_0$ as a ligand is:
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2973 Upvotes
Verified Answer
The correct answer is:
$\mathrm{CO}$
$\mathrm{CO}$
Following is the order of increasing value of $\Delta_0$ for the ligands.
$$
\begin{aligned}
&\mathrm{I}^{-} < \mathrm{Br}^{-} < \mathrm{Cl}^{-} < \mathrm{F}^{-} < \mathrm{H}_2 \mathrm{O} < \mathrm{Py}=\mathrm{NH}_3 < \text { en } \\
& < \mathrm{NO}_2-< < \mathrm{CN}^{-} < \mathrm{CO}
\end{aligned}
$$
$$
\begin{aligned}
&\mathrm{I}^{-} < \mathrm{Br}^{-} < \mathrm{Cl}^{-} < \mathrm{F}^{-} < \mathrm{H}_2 \mathrm{O} < \mathrm{Py}=\mathrm{NH}_3 < \text { en } \\
& < \mathrm{NO}_2-< < \mathrm{CN}^{-} < \mathrm{CO}
\end{aligned}
$$
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