Arrange the following in order of decreasing number of unpaired electrons: \( \mathrm{P} \) I: \...

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Arrange the following in order of decreasing number of unpaired electrons:
\( \mathrm{P} \)
I: \( \left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \quad \) II: \( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-} \)
W
III: \( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-} \quad \) IV: \( \left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+} \)
(a) IV, I, II, III
(b) I, II, III, IV
(c) III, II, I, IV
(d) II, III, I, IV
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