Choose the incorrect set from the following

A) ${\text{N}}_2$  is octet molecule, because the number of electrons on central atom is 8.

B) In $\text{BC}{l}_3$ , the number of electrons surrounding the central B atom is less than eight. So $\text{BC}{l}_3$  is an incomplete octet molecule

C) ${\text{BeH}}_2$  is not an odd electron molecule, it is also incomplete octet molecule.

$\text{H}:\text{Be}:\text{H}$

D) In $\text{PC}{l}_5$  more than eight valence electrons around the central atom P. Su, PCIT is an expanded octet molecule. Hence, option C is an incorrect set.