Which of the following p-block compounds mathematically yields a theoretical oxidation state for its — Redox Reactions and Volumetric Analysis Chemistry Question
Question
Which of the following p-block compounds mathematically yields a theoretical oxidation state for its central atom that strictly exceeds its maximum possible group valence, thereby unequivocally proving the existence of a peroxide linkage in its structure?
💡 Solution & Explanation
In Caro's acid ( $H_2SO_5$ ), calculating sulphur's O.S. via standard algebraic rules yields $2(+1) + x + 5(-2) = 0 \Rightarrow x = +8$ . However, sulphur belongs to Group 16 and possesses a maximum of 6 valence electrons, making an oxidation state of $+8$ fundamentally impossible. This mathematical impossibility confirms the presence of a peroxy linkage ( $-O-O-$ ) wherein two oxygens share a $-1$ state, capping the actual structural oxidation state of sulphur at its legitimate maximum of $+6$ .