Which of the following species contain(s) peroxo linkage? — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

**(A)** Marshall's acid ($HO_3S-O-O-SO_3H$). <br>**(B)** Butterfly structure with four O atoms in peroxides. <br>**(C)** Caro's acid ($HO-O-SO_3H$). <br>**(D)** Oleum contains a pyrosulfo linkage ($S-O-S$). [2, 4]