Question

The nature of $\pi$ -bonds in perchlorate ion is :

• A. $O\left(d\pi \right)-Cl\left(p\pi \right)$
• B. $O\left(p\pi \right)-Cl\left(d\pi \right)$
• C. $O\left(d\pi \right)-Cl\left(d\pi \right)$
• D. $O\left(p\pi \right)-Cl\left(p\pi \right)$

Answer 1

The correct option is B $O\left(p\pi \right)-Cl\left(d\pi \right)$

The nature of $\pi$ -bonds in perchlorate ion is $O\left(p\pi \right)-Cl\left(d\pi \right)$

The $Cl$ atom has $3s,3p$ and $3d$ orbitals. $3s$ and $3p$ orbitals are filled and $3d$ orbitals are vacant. These vacant $3d$ orbitals are used in the formation of $\pi$ bond with $\pi$ orbitals of $O$ atoms.