8.3: Resonance

Exercise \(\PageIndex{1}\)

In benzene, C₆H₆, the six carbon atoms are arranged in a ring. Two equivalent Lewis structures can be drawn for benzene. In both structures, the carbon atoms have a trigonal planar geometry. These two equivalent structures are referred to as ________ structures.

Answer

resonance

Exercise \(\PageIndex{2}\)

Which of the following is not a valid resonance structure for N₃^–?

a.         b.         c.         d.         e. all are correct

Answer

a.   

Exercise \(\PageIndex{3}\)

Which of the following are the correct resonance structures for the formate ion, HCO₂^–?

a. 1 and 2        b. 2 and 3        c. 3 and 4        d. 1, 3, and 4        e. 2, 3, and 4

Answer

c. 3 and 4 

Exercise \(\PageIndex{4}\)

Which of the following exhibits resonance?

a. SCl₄        b. H₂O        c. SO₂        d. BH₃        e. none

Answer

c. SO₂ 

Exercise \(\PageIndex{5}\)

Which of the following molecules or ions does not have one or more resonance structures?

a. O₃        b. OCN^–        c. SO₂        d. H₂CO        e. NO₃^–

Answer

d. H₂CO