Discussion
In which of the following compounds there is an expanded octet around the central atom?
Answer: E
The expanded octet is in H2SO4.
In the usual Lewis structure of sulphuric acid, sulphur forms two S=O double bonds and two S–OH single bonds, giving it 12 electrons in its valence shell. Sulphur, a period 3 element, can exceed the octet.
In SCl2, sulphur has two bond pairs and two lone pairs (8 electrons); NH3 and PCl3 have exactly an octet around N and P; and NO2 is an odd-electron molecule with fewer than eight electrons around nitrogen, an incomplete octet rather than an expanded one.
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