The correct decreasing order of oxidation state of the underlined atom in each molecule is

Step-by-step solution

Let us calculate the oxidation state of the underlined atom in each molecule. For option (1): Oxidation state of P in P ₄ O ₆ is +3 . Oxidation state of Cl in Cl ₂ O ₇ is +7 . Oxidation state of Al in AlH ₃ is +3 . Order: +3 +3 (Incorrect) For option (2): Oxidation state of P in P ₄ O ₁₀ is +5 . Oxidation state of S in SO ₃ is +6 . Oxidation state of O in H ₂ O is -2 . Order: +5 -2 (Incorrect) For option (3): Oxidation state of N in N ₂ O ₅ is +5 . Oxidation state of Al in Al ₂ O ₃ is +3 . Oxidation state of S in H