The sets of molecules in which the central atom has no lone pair of electrons are: i. SnCl2, NH3, SF4 ii. HgCl2, SO3, SF6 iii. BeCl2, BF3, PCl5 iv. ClF3, BrF5, XeF6

Consider superoxide O2− and peroxide O22−. Which statement is correct regarding their IR activity and magnetism?

The correct order of O–O bond lengths in O2, O2+, O2-, and O22- is:

In the ozone (O3) molecule, the correct formal charges on oxygen atoms numbered 2 (double-bonded terminal O), 1 (central O) and 3 (single-bonded terminal O) respectively are: