Which of the following species is a radical?

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(B) free radical is a species that contains an odd number of electrons,making it paramagnetic and highly reactive.In $NO$,the total number of valence

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$NO$

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(B) free radical is a species that contains an odd number of electrons,making it paramagnetic and highly reactive.In $NO$,the total number of valence electrons is $5$ (from $N$) $+ 6$ (from $O$) $= 11$,which is an odd number.In $CO_2$,the total number of valence electrons is $4$ (from $C$) $+ 2 	imes 6$ (from $O$) $= 16$ (even).In $NO_2^{-}$,the total number of valence electrons is $5$ (from $N$) $+ 2 	imes 6$ (from $O$) $+ 1$ (negative charge) $= 18$ (even).In $CN^{-}$,the total number of valence electrons is $4$ (from $C$) $+ 5$ (from $N$) $+ 1$ (negative charge) $= 10$ (even).Therefore,$NO$ is the radical.

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