Which of the following molecule has odd ${\mathrm{e}}^{-}$?

Because of their unusual total amount of electrons, ${\mathrm{ClO}}_2$ molecules are odd electron molecules. According to a Lewis structure, ${\mathrm{ClO}}_2$ has a total of 26+7=19 valence electrons, or 9 electron pairs and a lone electron. $\mathrm{Cl}$acts as the principal atom. The ${\mathrm{ClO}}_2$ molecule is made up of valence electrons with unusual configurations.