MCQ
The correct order of $'S-O'$ bond length is
- A$SO^{2-}_3 > SO^{2-}_4 > SO_3 > SO_2$
- ✓$SO^{2-}_3 > SO^{2-}_4 > SO_2 > SO_3$
- C$SO^{2-}_4 > SO^{2-}_3 > SO_2 > SO_3$
- D$SO^{2-}_4 > SO^{2-}_3 > SO_3 > SO_2$

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$\begin{array}{*{20}{c}}
{C{H_3} - CH - CH - C{H_2} - C{H_3}} \\
{\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{\,\,CN\,\,\,\,\,\,\,\,\,CH = C{H_2}\,\,}
\end{array}$