Answer: HClO < HClO2 < HClO3 < HClO4.
- A HClO < HClO2 < HClO3 < HClO4
- B HClO4 < HClO3 < HClO2 < HClO
- C HClO = HClO4
- D All equal
Correct answer: A. HClO < HClO2 < HClO3 < HClO4
Explanation: More electronegative Cl in higher oxidation states withdraws electron density from O-H bonds, making them more acidic. HClO4 is the strongest acid.
Xenon tetrafluoride (XeF4) has six electron domains around xenon — four Xe–F bonds plus two lone pairs. The lone pairs occupy opposite axial positions, leaving the four fluorine atoms in a square-planar shape (Xe–F ≈ 194 pm). Image: ChemSim, Public Domain, via Wikimedia Commons.
Concept context
Covers the nitrogen family (Group 15), oxygen family (Group 16), halogens (Group 17), and noble gases (Group 18). One of the highest-weightage inorganic chapters in NEET and JEE - includes preparation and properties of HNO₃, H₂SO₄, interhalogens, and xenon compounds.