Question
Chemistry Question on Chemical bonding and molecular structure
The correct order in which the O—O bond length increases in the following is:
A
H2O2<O2<O3
B
O3<H2O2<O2
C
O2<O3<H2O2
D
O2<H2O2<O3
Answer
O2<O3<H2O2
Explanation
Solution
The relationship between bond length and bond strength is inverse, while the relationship between bond strength and bond dissociation energy is direct. Since H2 O2 has a single bond, O3 has a partial double bond due to resonance, and O2 has a double bond, the right sequence is O2 O3H2 O2. O-O's bond length in O2 is 1.21A0, O3 is 1.2730A0, and H2 O2 is 1.49A0.
Therefore, the correct option is (C): O2<O3<H2O2