Which amongst the following is incorrect statement?
- The bond orders of O2+, O2, O2- and O22- are 2.5, 2, 1.5 and 1, respectively.
- C2 molecule has four electrons in its two degenerate 𝜋 molecular orbitals.
- H2+ ion has one electron.
- O2+ ion is diamagnetic.
The Correct Option is D
Solution and Explanation
The question involves determining the incorrect statement among the given options. To solve this, we will review each statement briefly based on known chemical principles.
- Statement 1: Bond Orders of O2+, O2, O2-, and O22-
Bond order can be calculated using molecular orbital theory as:
- O2: Electronic configuration: (σ2s)2(σ*2s)2(σ2pz)2(π2px, π2py)4(π*2px, π*2py)2
Bond order = (10-6)/2 = 2 - O2+: One electron removed from antibonding π* orbital
Bond order = (10-5)/2 = 2.5 - O2-: One electron added to antibonding π* orbital
Bond order = (10-7)/2 = 1.5 - O22-: Two electrons added to antibonding π* orbital
Bond order = (10-8)/2 = 1 - Statement 2: C2 molecule electrons
C2 has an electronic configuration of (σ2s)2(σ*2s)2(π2px, π2py)4. Hence, it has 4 electrons in π orbitals. This is correct.
- Statement 3: H2+ ion
The H2+ ion has only one electron, as it is formed by removing an electron from H2. This is correct.
- Statement 4: O2+ ion is diamagnetic
O2+ has an unpaired electron making it paramagnetic, not diamagnetic. Hence, this statement is incorrect.
Therefore, the incorrect statement is: O2+ ion is diamagnetic.
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Concepts Used:
Chemical Bonding and Molecular Structure
Such a group of atoms is called a molecule. Obviously, there must be some force that holds these constituent atoms together in the molecules. The attractive force which holds various constituents (atoms, ions, etc.) together in different chemical species is called a chemical bond.
Types of Chemical Bonds:
There are 4 types of chemical bonds which are formed by atoms or molecules to yield compounds.
- Ionic Bonds - Ionic bonding is a type of chemical bonding which involves a transfer of electrons from one atom or molecule to another.
- Covalent Bonds - Compounds that contain carbon commonly exhibit this type of chemical bonding.
- Hydrogen Bonds - It is a type of polar covalent bonding between oxygen and hydrogen wherein the hydrogen develops a partial positive charge
- Polar Bonds - In Polar Covalent chemical bonding, electrons are shared unequally since the more electronegative atom pulls the electron pair closer to itself and away from the less electronegative atom.
Factors Affecting Bond Enthalpy in Chemical Bonding:
- Size of the Atom
- Multiplicity of Bonds
- Number of Lone Pair of Electrons Present
- Bond Angle