MCQ
The electrophilic aromatic substitution proceeds through a
- Afree radical
- ✓sigma complex
- Cbenzyne
- Dcarbene

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$\begin{array}{*{20}{c}}
{C{H_3} - C{H_2} - C - CH - CHO} \\
{\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,|} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,O\,\,\,\,\,\,\,CN}
\end{array}$
is :