Worksheet: Conjugation and Resonance Structures

In this worksheet, we will practice representing resonance and conjugation and describing the effects of electron delocalization on charges and bond orders.

Q1:

Which of the following species has the greatest number of resonance structures?

  • ASulfite
  • BNitrite
  • CNitrous oxide
  • DAcetate
  • EBenzene

Q2:

Hydrogen sulfide is produced from metallic zinc in two reaction steps.

Write a balanced molecular equation for the first step, a reduction–oxidation reaction.

  • A2Zn+2HSO2ZnS+2HO+3O2422
  • BZn+SOZnS+O22
  • CZn+3SOZnS+2SO23
  • DZn+NaS2Na+ZnS2
  • EZn+SZnS

Write a balanced molecular equation for the second step, an acid–base reaction.

  • AZnS+HZn+HS22
  • BZnS+2HOZn(OH)+HS222
  • CZnS+2NaOHZnO+HS+NaO22
  • DZnS+2HClZnCl+HS22
  • EZnS+HOZnO+HS22

Q3:

In which of the following species are the 𝜋 electrons not delocalized?

  • ACO2
  • BPO43
  • CO3
  • DClO3
  • ENO2

Q4:

Which of the following arrows is used to indicate resonance?

  • A
  • B
  • C
  • D
  • E

Q5:

Which of the following is always true for a molecule displaying two resonance structures?

  • AThe actual bond order is halfway between the bond orders in the resonance structures.
  • BThe resonance structures can have different molecular geometries.
  • CThe atomic charges in the molecule alternate between those in the resonance structures.
  • DThe resonance structures have the same molecular orbital diagram.
  • EResonance is an equilibrium process.

Q6:

Which of the following is a valid resonance structure of sulfur dioxide?

  • A
    S+OO
  • B
    SOO
  • C
    S+OO
  • D
    SOO+
  • E
    S+OO

Q7:

Which of the following molecules requires the least energy to rotate around the CC bond linking the two rings?

  • A
  • B
  • C
  • D
  • E

Q8:

How many delocalized electrons are present in the molecule shown?

S
  • A10
  • B6
  • C8
  • D14
  • E12

Q9:

How many delocalized electrons are present in the shown molecule?

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