Answer
a) $CCl_{4}$
b) $PCl_{5}$
c} $BCl_{3}$
Work Step by Step
a) In $CCI_{4}$ C and Cl contain 8 electrons in their valence shell. Therefore it is a molecule that obeys the octet rule.
b) In $PCI_{5}$ P contains 10 electrons in its valence shell. Therefore it is an example of an expanded octet molecule.
c) In $BCI_{3}$ B contains 6 electrons in its valence shell. Therefore it is an example of an incomplete octet molecule.