MCQs on Covalent Bonding The octet rule is not valid for the molecule CO2 H2O O2 CO Answer: (d) The nature of bonding in CCl4 and CaH2 is electrovalent in both CCl4 and CaH2 covalent in CCl4 and electrovalent in CaH2 electrovalent in CCl4 and covalent in CaH2 covalent in …