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Number of molecules/ions from the following in which the central atom is involved in sp3 hybridization is NO3−, BCl3, ClO2−, ClO3−

1. (1) 2
2. (2) 4
3. (3) 3
4. (4) 1

Correct answer: (1) 2

Solution

In sp3 hybridization, the central atom forms four equivalent hybrid orbitals, which is characteristic of molecules like ClO2− and ClO3−, where the central chlorine atom is bonded to multiple atoms. NO3− and BCl3 do not exhibit sp3 hybridization; NO3− has a trigonal planar structure (sp2), and BCl3 is also trigonal planar (sp2), thus confirming that only two of the given species involve sp3 hybridization.

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