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Choose incorrect stability order :
\( \mathrm{P} \)
(a) \( \left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\left[\mathrm{Cu}(\mathrm{en})_{2}\right]^{2+}[\mathrm{Cu}(\text { trien })]^{2+} \)
W
(b) \( \left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\left[\mathrm{Fe}\left(\mathrm{NO}_{2}\right)_{6}\right]^{3-}\left[\mathrm{Fe}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} \)
(d) \( \left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{1+}\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+} \)
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