The total number of \(Mn=O\) bonds in \(Mn_2O_7\) is ___.
- 4
- 5
- 6
- 3
The Correct Option is C
Approach Solution - 1
To determine the total number of \( \text{Mn=O} \) bonds in \( \text{Mn}_2\text{O}_7 \), we must first understand the structure of the compound.
\( \text{Mn}_2\text{O}_7 \) is known as manganese(VII) oxide. Its structure is characterized by two tetrahedral \( \text{MnO}_4 \) units connected by an oxygen bridge. In this compound, each manganese (Mn) atom is bonded to four oxygen atoms. Out of these, one oxygen atom serves as a bridge between the two Mn atoms, and the other three are terminal oxygens bonded to manganese, forming double bonds.
The structure can be described as:
- Each \( \text{Mn} \) atom forms two double bonds (\( \text{Mn=O} \)) with terminal oxygen atoms.
- There is a bridging oxygen, which is shared by the two \( \text{MnO}_4 \) units.
For clarity, consider the structure:
- \( \text{Mn}_1 - \text{O} = \text{O} \)
- \( \text{Mn}_1 = \text{O} \), \( \text{Mn}_1 = \text{O} \)
- \( \text{Mn}_2 - \text{O} = \text{O} \)
- \( \text{Mn}_2 = \text{O} \), \( \text{Mn}_2 = \text{O} \)
- One bridged \( \text{O} \) between \( \text{Mn}_1 \) and \( \text{Mn}_2 \)
From this structure, we can observe that there are exactly three double bonds for each manganese atom:
- Three terminal oxygens each form a double bond with \( \text{Mn}_1 \).
- Three terminal oxygens each form a double bond with \( \text{Mn}_2 \).
Thus, the total number of \( \text{Mn=O} \) bonds in \( \text{Mn}_2\text{O}_7 \) is 6.
Therefore, the correct answer to the question is 6.
Approach Solution -2
Structure of \(Mn_2O_7\) is as :
\(∴\) There are total \(6\) \(M = O\) bonds are present in \(Mn_2O_7\) compound.
The correct answer is (C): \(6\)
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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