Shortcut methods to find Bond order?

Question

Answer

If there are more than two atoms in the molecule, follow these steps to determine the bond order:

Draw the Lewis structure.

Count the total number of bonds.

Count the number of bond groups between individual atoms.

Divide the number of bonds between atoms by the total number of bond groups in the molecule.

Answer

Trick to Find Bond Order JEE Advanced || JEE Main || AIIMS || NEET

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Answer

Shortcut methods to find Bond Order

Bond order is a measure of the strength and stability of a chemical bond. It indicates the number of chemical bonds between two atoms. A higher bond order generally indicates a stronger and more stable bond. There are several shortcut methods to determine the bond order of a molecule. Let's explore them in detail:

1. Lewis Structure Method:
- Draw the Lewis structure of the molecule, which shows the arrangement of atoms and their valence electrons.
- Count the total number of bonds between the atoms.
- Divide the total number of bonds by the total number of bond groups (either bonds or lone pairs) surrounding the central atom.
- The resulting value is the bond order.

2. Molecular Orbital Theory Method:
- Utilize the molecular orbital theory to determine the bond order.
- First, calculate the total number of electrons in the molecule by summing the valence electrons of all atoms.
- Next, construct the molecular orbital diagram by combining the atomic orbitals of the atoms in the molecule.
- Fill the molecular orbitals with electrons according to the Aufbau principle and Hund's rule.
- Count the number of electrons in bonding orbitals and anti-bonding orbitals.
- Subtract the number of electrons in anti-bonding orbitals from the number of electrons in bonding orbitals.
- Divide the result by 2 to obtain the bond order.

3. Valence Bond Theory Method:
- Apply the valence bond theory to determine the bond order.
- Identify the hybridization of the central atom.
- Count the number of sigma bonds between the atoms.
- Subtract the number of pi bonds from the sigma bonds.
- Divide the result by 2 to obtain the bond order.

4. Bond Length Method:
- Compare the bond lengths of similar bonds in different molecules.
- Shorter bond lengths typically correspond to higher bond orders, indicating stronger bonds.

It is important to note that these methods provide approximate values of bond order and may not be applicable to all molecules. Additionally, experimental data and computational methods can also be used to determine bond order accurately.

Overall, these shortcut methods allow for a quick estimation of bond order, providing insights into the nature and strength of chemical bonds within a molecule.

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