Question

The magantate and permanganate ions are tetrahedral, due to :

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> NEET 2019

• A. The $\pi$-bonding involves overlap of d-orbitals of oxygen with d-orbitals of maganese
• B. There is no $\pi$-bonding
• C. The $\pi$-bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese
• D. The $\pi$-bonding involves overlap of p-orbitals of oxygen with p-orbitals of maganese

Answer 1

The correct option is C The $\pi$-bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese

$\bullet$ Permanganate $\left(Mn{O}_4^{2-}\right)$ :

$\Rightarrow \pi$-bonds are of $d\pi -p\pi$ type
In this manganate ion, two oxygen atoms are having a double bond with the manganese atom while remaining two oxygen atoms are having a single bond.
In this manganate ion, π bonds belong to p-orbitals of oxygen and with d-orbitals of manganese $(d\pi –p\pi )$


$\bullet$ Permanganate $\left(Mn{O}_4^{-}\right)$ :


$\Rightarrow \pi$-bonds are of $d\pi -p\pi$ type.
In this permanganate ion, three oxygen atoms are having a double bond with manganese atom and one oxygen atom is having a single bond with manganese atom.
In this permanganate ion, $\pi$ bonds belong to p-orbitals of oxygen and with d-orbitals of manganese $(d\pi –p\pi )$
As a result, the manganate and permanganate ions are tetrahedral, due to the π bonding involving overlap of p-orbitals of oxygen with d-orbitals of manganese.