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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ev104

Which of the following species are free radicals (contain an unpaired electron)?

A $Cl$ atom
B $ClO$
C $HCl$
D $NO$

Answer: A, B, D

A Cl atom has seven valence electrons (one unpaired), ClO has 13 valence electrons, and NO has 11. All have odd electron numbers.

HCl

has 8 valence electrons, all paired.

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