(C) The compound $CrO_6$ is a peroxide derivative of chromium. In this structure,$Cr$ is bonded to four oxygen atoms via two peroxide linkages $(-O-O-

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(C) The compound $CrO_6$ is a peroxide derivative of chromium. In this structure,$Cr$ is bonded to four oxygen atoms via two peroxide linkages $(-O-O-)$ and one double-bonded oxygen atom,or more accurately,it is a butterfly structure where $Cr$ is in the $+6$ oxidation state. Since the maximum oxidation state of $Cr$ is $+6$,it maintains this state in $CrO_6$.