CHEMISTRY · Multi-part · AP · Chemistry · Compound Structure and Properties · Compound Structure and Properties
Problem
The hydroperoxyl radical, HO2, is formed in the troposphere during photochemical cycles that involve water vapor and ozone.
Answer the following questions about HO2.
(a) Determine the total number of valence electrons in HO2.
(b) Draw all significant Lewis resonance structures for HO2, clearly indicating the position of the unpaired electron and any formal charges.
(c) Rank the resonance structures in part (b) from most stable to least stable. Justify your ranking by discussing electronegativity considerations and formal-charge minimization.
(d) Using your resonance analysis, predict whether the O–O bond in HO2 is expected to be stronger, weaker, or approximately the same as the O–O bond in hydrogen peroxide, H2O2. Provide a reasoning that references bond order.