Select the correct pair of bond oder.

CONCEPT:

Bond Order in Molecules

B.O. = (Number of bonding electrons - Number of anti-bonding electrons) / 2

• Bond order is defined as the number of chemical bonds between a pair of atoms. In molecular orbital theory, bond order (B.O.) can be calculated using the formula:
• For molecules with multiple bonds or resonance structures, bond order is often fractional, representing an average of bond strengths.
• Let’s consider the molecules provided and calculate their bond orders:

EXPLANATION:​

• NO⁺ (Nitrosonium ion):
  • NO has 11 electrons, but NO⁺ has one less electron due to the positive charge.
  • The bond order of NO⁺ is 3, as it has a triple bond with 10 bonding electrons and 4 anti-bonding electrons.
• CO (Carbon Monoxide):
  • CO has 10 electrons in the bonding molecular orbitals and 4 electrons in the anti-bonding molecular orbitals.
  • The bond order of CO is 3, indicating a triple bond between C and O.
• O₂²⁻ (Peroxide ion):
  • O₂²⁻ has 12 electrons in bonding orbitals and 6 electrons in anti-bonding orbitals.
  • The bond order for O₂²⁻ is 1, indicating a single bond between the oxygen atoms.
• The correct pair of bond orders is option 2: NO⁺: 3, CO: 3, O₂²⁻: 1.