Answer
The correct answer is $(d)$ $(NO_2)$
Work Step by Step
In $NO_2$, the N has 5 valence electrons and O has 6 valence electrons. The sum of valence electrons is an odd number. So, it is expected to be a free radical.
Chemistry: Molecular Approach (4th Edition)
by Tro, Nivaldo J.
Published by
Pearson
ISBN 10:
0134112830
ISBN 13:
978-0-13411-283-1
Chapter 9 - Section 9.9 - Exceptions to the Octet Rule: Odd-Electron Species, Incomplete Octets, and Expanded Octets - Conceptual Connection - Page 408: 9.6
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