NH3, SO2, SiO2, BeCl2, C2H2, C2H4, BCl3, HCHO, C6H6, BF3, C2H4Cl2
Correct Answer: 6
SO2, C2H4, BCl3, HCHO, C6H6 and BF3 have sp2 hybridized central atoms.
All remaining species have either sp or sp3 hybridization.