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# The O-O bond is not present in

$\begin{array}{1 1}(a)\;H_2SO_5\\(b)\;CrO_5\\(c)\;HNO_4\\(d)\;HClO_4\end{array}$

Can you answer this question?

In $HClO_4$, $Cl$ oxidation state does not exceeds its group number so it is not having proxy bond.
Hence (d) is the correct answer.
answered Jan 23, 2014