These compounds exhibit the captodative (“CAP-toe-DAY-tiv”) effect when they have both electron-withdrawing and electron-donating groups. TEMPO is a (10[1])“persistent” one of these compounds used as a probe in EPR spectroscopy, which can identify these compounds from their paramagnetism. These compounds are formed when UV light overcomes the bond-dissociation energy in homolytic (10[1])cleavage. (10[2])“Fish-hooks” are used in (10[1])arrow-pushing mechanisms involving these compounds. Reactive oxygen species and these compounds can be “scavenged” by vitamin C and other antioxidants. For 10 points, name these highly reactive (10[1])compounds with an unpaired (10[1])valence (10[2])electron. ■END■ (10[2]0[4])