MCQ
The correct order of $Cl - O$ bond order is
- A$ClO^-_3 < ClO^-_4 < ClO^-_2 < ClO^-$
- B$ClO^- < ClO^-_4 < ClO^-_3 < ClO^-_2$
- ✓$ClO^- < ClO^-_2 < ClO^-_3 < ClO^-_4$
- D$ClO^-_4 < ClO^-_3 < ClO^-_2 < ClO^-$
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$\begin{array}{*{20}{c}} {{H_3}C - C{H_2} - CH - Et} \\ {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \end{array}$ about $C_2-C_3$ is (figure) 
(Mass of proton $= 1.67 \times 10^{-27}\, kg$ and $h = 6.63 \times 10^{-34}\, Js$)