Which of the following compounds does not follow the octet rule?

The molecule in which central atom is associated with more than 8 electrons is known as hypervalent molecule and less than 8 electrons is known as hypovalent molecule. Which of the following compound does not follow the octet rule?

Which of the following compounds do not follow octet rule ?

Which of the following molecules/ ions doesn't follow the octet rule ?

Identify the atoms in each of the following compounds which do not obey the octet rule: NH_3

Identify the atoms in each of the following compounds which do not obey the octet rule: BeF_2

Identify the atoms in each of the following compounds which do not obey the octet rule: BCl_3

Identify the atoms in each of the following compounds which do not obey the octet rule: SF_6

Identify the atoms in each of the following compounds which do not obey the octet rule: PCl_5