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Acidic strength increases as the oxidation number of central atom increases.

1. HClO < HClO2 < HClO3 < HClO4 (+1 < +3 < +5 < +7)
2. Bond dissociation enthalpy decreases as the bond distance increases from F2 to I2. This is due to increase in the size of the atom, on moving from F to I.
3. F – F bond dissociation enthalpy is smaller than Cl – Cl and even smaller than Br – Br. This is because F atom is very small and hence the three lone pairs of electrons on each F atom repel the bond pair holding the F-atoms in F2 molecules.
4. The increasing order of bond dissociation enthalpy is I2 < F2 < Br2 < Cl2

Correct answer: HClO < HClO2 < HClO3 < HClO4 (+1 < +3 < +5 < +7)

Solution

The acidic strength of oxoacids increases with the oxidation number of the central atom due to greater electron-withdrawing power, which stabilizes the conjugate base. HClO4 has the highest oxidation state (+7), making it the strongest acid.

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