An important physiological reaction of nitric oxide (NO) is it...

Question

An important physiological reaction of nitric oxide (NO) is its interaction with the superoxide ion (O₂^–) to form the peroxynitrite ion (ONOO^–).

a. Write electron-dot structures for NO, O₂^–, and ONOO^–, and predict the O–N–O bond angle in ONOO^–.

Accepted Answer

Step 1: Draw the electron-dot structure for NO. Start by counting the total number of valence electrons. Nitrogen (N) has 5 valence electrons and oxygen (O) has 6 valence electrons, giving a total of 11 valence electrons. Distribute these electrons to satisfy the octet rule as much as possible, keeping in mind that NO is a radical with an unpaired electron.. Step 2: Draw the electron-dot structure for the superoxide ion, O_{2}^{–}. Oxygen has 6 valence electrons, so for O_{2}, you have 12 valence electrons. The extra negative charge adds one more electron, making it 13 electrons in total. Distribute these electrons to form a bond between the two oxygen atoms, and place the extra electron on one of the oxygens.. Step 3: Draw the electron-dot structure for the peroxynitrite ion, $$ONOO^{–}. $$Count the total valence electrons: O (6) + N (5) + O (6) + 1 (for the negative charge) = 18 electrons. Arrange these electrons to form bonds between the atoms, ensuring that the octet rule is satisfied for each atom as much as possible.. Step 4: Consider the resonance structures for $$ONOO^{–}. $$Since $$ONOO^{–}$$ can have multiple valid electron-dot structures, draw the possible resonance forms to show the delocalization of electrons.. Step 5: Predict the O–N–O bond angle in $$ONOO^{–}. $$Consider the electron pair geometry around the nitrogen atom. Since $$ONOO^{–} is a $$bent molecule due to the presence of lone pairs on the nitrogen, the bond angle will be less than 120 degrees, typical for a bent molecular geometry.

An important physiological reaction of nitric oxide (NO) is its interaction with the superoxide ion (O₂^–) to form the peroxynitrite ion (ONOO^–).
a. Write electron-dot structures for NO, O₂^–, and ONOO^–, and predict the O–N–O bond angle in ONOO^–.

Verified video answer for a similar problem:

Key Concepts

Electron-Dot Structures

Bond Angles and Molecular Geometry

Reactivity of Nitric Oxide and Superoxide

An important physiological reaction of nitric oxide (NO) is its interaction with the superoxide ion (O2–) to form the peroxynitrite ion (ONOO–).a. Write electron-dot structures for NO, O2–, and ONOO–, and predict the O–N–O bond angle in ONOO–.