Worksheet: Sigma and Pi Bonding

In this worksheet, we will practice describing the energies and electron densities of bonds formed by sigma and pi overlap of s, p, d, and f orbitals.

Q1:

How many 𝜋 bonds are present in N2?

Q2:

How many 𝜋 bonds are present in acetylene, CH22?

Q3:

Which of the following statements is true?

  • AAtoms can be linked by only one 𝜋 bond.
  • BA 𝜎 bond is formed by lateral overlap of atomic orbitals.
  • CThe bond energy of a 𝜋 bond is usually greater than that of a 𝜎 bond.
  • DA 𝜋 bonding orbital can contain more electrons than a 𝜎 bonding orbital.
  • EElectron density in a 𝜋 bond is concentrated in lobes on either side of the internuclear axis.

Q4:

How many 𝜋 electrons are present in benzene?

Q5:

What kind of molecular orbital forms when the two atomic orbitals shown interact in the manner indicated?

  • A 𝜋
  • B 𝜎
  • C 𝜋
  • D 𝜎

Q6:

What kind of molecular orbital forms when the two atomic orbitals shown interact in the manner indicated?

  • A 𝜋
  • B 𝜎
  • C 𝜋
  • D 𝜎

Q7:

Which of the following diagrams correctly illustrates the phases and orientations of the atomic orbitals giving rise to a 𝜋 orbital?

  • A
  • B
  • C
  • D
  • E

Q8:

Which of the following represents the bonding orbital overlap in Cl2?

  • A
  • B
  • C
  • D
  • E

Q9:

Which of the following represents the highest energy bonding orbital of O2?

  • A
  • B
  • C
  • D
  • E

Q10:

Which of the following represents the orbital overlap in HCl?

  • A
  • B
  • C
  • D
  • E

Q11:

Which of the following represents the orbital overlap in ICl?

  • A
  • B
  • C
  • D
  • E

Q12:

Which of the following represents the highest energy bonding orbital of N2?

  • A
  • B
  • C
  • D
  • E

Q13:

What is the CC double bond in alkenes made of?

  • AOne 𝜎 and one 𝜋 bond
  • BTwo 𝜋 bonds
  • CTwo 𝜎 bonds
  • DOne 𝜎 and two 𝜋 bonds

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