Identify the incorrect statements.

P. HI has lower boiling point than HCl. Q. UF₆ is more covalent than UF₄. R. All halogens can exhibit positive oxidation states. S. Bleaching action of chlorine is due to oxidation.

Select the correct answer using codes given below:

With increase in size magnitude of intermolecular van der Waal forces increases. Thus, boiling point also increases. Because iodide ion is larger in size than chloride ion, HI has higher boiling point than HCl. If a metal exhibits more than one oxidation state, the halides in higher oxidation state will be more covalent than the one in lower oxidation state. For example: SnCl₄, PbCl₄, SbCl₅ and UF₆ are more covalent than SnCl₂, PbCl₂, SbCl₃ and UF₄ respectively.