MCQ
The element or elements whose position is anomalous in the periodic table is
- AHalogens
- B$Fe,\,Co$ and $Ni$
- CInert gases
- ✓Hydrogen
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$C_6H_5-CHO + C_6H_5CHO$ $\xrightarrow{{N{a_2}[Fe{{(CO)}_4}]}}$ $\begin{array}{*{20}{c}}
{O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{{C_6}{H_5} - C - O - C{H_2}{C_6}{H_5}}
\end{array}$