MCQ
Among the following complexes the one which shows Zero crystal field stabilization energy $(CFSE)$ is
- A$[Mn(H_2O)_6]^{3+}$
- ✓$[Fe(H_2O)_6]^{3+}$
- C$[Co(H_2O)_6]^{2+}$
- D$[Co(H_2O)_6]^{3+}$

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$[A]$ $\mathrm{Cr}_2 \mathrm{O}_3, \mathrm{BeO}, \mathrm{SnO}, \mathrm{SnO}_2$
$[B]$ $\mathrm{Cr}_2 \mathrm{O}_3, \mathrm{CrO}, \mathrm{SnO}, \mathrm{PbO}$
$[C]$ $\mathrm{NO}, \mathrm{B}_2 \mathrm{O}_3, \mathrm{PbO}, \mathrm{SnO}_2$
$[D]$ $\mathrm{ZnO}, \mathrm{Al}_2 \mathrm{O}_3, \mathrm{PbO}, \mathrm{PbO}_2$

$\underset{(1)}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}{{O}^{-}}}}\,\,\,\,\,\,\underset{(2)}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}{{S}^{-}}}}\,\,\,\,\underset{(3)}{\mathop{\begin{matrix}
\,\,\,\,\,\,\,O \\
\,\,\,\,\,\,\,\,|| \\
C{{H}_{3}}C{{H}_{2}}C-{{O}^{-}} \\
\end{matrix}}}\,$