Solve this: Q.4.Which is not an exception to octet rule ? (1) B F 3 (2) S n C l 4 (3) B e I 2 (4) C l O 2 Share with your friends Share 5 Vartika Jain answered this Dear Student, In BF3, B has 3 electrons in its its outermost shell and it shares 3 electrons with 3F atoms giving total 6 electrons, so it is is an electron deficient specie as it has incomplete octet. Therefore it is an exception. In SnCl4, Sn has 4 electrons in its valence shell which it shares with 4 electrons of Cl atoms respectively giving total 8e- and so it follows octet rule. In BeI2, Be has 2 electrons in its outermost shell and it shares 2 electrons from 2I atoms giving total 4 electrons, so it is electron deficient and hence donot follow octet rule. In ClO2, Cl has 7 electrons in its outermost shell. It shares two electrons with one O atoms and one electron with the other O atom giving total 10 electrons. So it has excess electrons and so donot follow octet rule. Hence, correct answer is (2) 17 View Full Answer Anshul Shroff answered this BF3 -5