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Most reactive free radical is:

# Out of the various free radical species, the following radical is most reactive:
A. Superoxide (O2-)
B. Hydrogen peroxide (H2O2)
C. Hydroxyl (OH-)
D. Nitric oxide (NO)



The correct answer is C. Hydroxyl Ion (OH-)
Important mechanisms of cell injury are by damage to DNA, proteins, lipid membranes, and circulating lipids (LDL) by peroxidation caused by oxygen-derived free radicals- superoxide anion (O2-), hydroxyl radical (OH-) and hydrogen peroxide (H2O2). Hydroxyl ion is the most reactive.

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