Question

The molecule having one unpaired electron is
a)NO b)CO c)CN- d)O2

Answer 1

(A)NO
Steric no.= 5+6/8= 11/8 hence it is not possible to get an odd no. as numerator as electrons exist in pairs in covalent bonds there for 5 pairs of electrons with one odd electron. you can also draw it structure and can see

Answer 2

Explanation:

NO has only one unpaired electron. We know that NO is nitric oxide that is formed by the reaction of nitrogen and oxygen. Nitrogen has 7 electrons of which only 5 in the second shell are free for bonding. Oxygen has 6 available electrons in its second shell for bonding. The bonding in NO has 11 electrons and there is no possibility in which an atom can be surrounded by eight electrons.

NO does not obey the “Octet” rule wherein each atom required eight electrons around it. For NO, the octet rule does not apply to nitrogen atom.