MCQ
In $[Fe(CO)_5],$ the $Fe-C$ bond has
- A$\pi $ character only
- B$\sigma $ character only
- Cionic character only
- Dboth $\pi $ and $\sigma $ character
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${{C}_{6}}{{H}_{5}}OH+CC{{l}_{4}}\underset{(2)\,\,{{H}^{+}}}{\mathop{\xrightarrow{(1)\,\,NaOH}}}\,$