MCQ
Finely divided iron combines with $CO$ to give
- ✓$Fe{(CO)_5}$
- B$F{e_2}{(CO)_9}$
- C$F{e_3}{(CO)_{12}}$
- D$Fe{(CO)_6}$
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$2X_2(s) + 3Y^{2+} (aq) \to 2X_2^{3+}(aq) + 3Y(s)$
$\begin{matrix}
C{{H}_{3}}\,\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
{{H}_{3}}C-C-CH=C{{H}_{2}} \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
C{{H}_{3}}\,\,\,\,\,\,\,\,\, \\
\end{matrix}$
$\mathop {C{H_3} - }\limits_\delta \mathop {C{H_2} - }\limits_\gamma \mathop {CH = }\limits_\beta \mathop {C{H_2}}\limits_\alpha $
$(E)$
$(A)$ Total number of valence shell electrons at metal centre in $Fe ( CO )_5$ or $Ni ( CO )_4$ is $16$
$(B)$ These are predominantly low spin in nature
$(C)$ Metal-carbon bond strengthens when the oxidation state of the metal is lowered
$(D)$ The carbonyl $C - O$ bond weakens when the oxidation state of the metal is increased