Can pi bonds be made from d-orbitals?
No, pi bonds generally cannot be formed by d-orbitals alone. Pi (π) bonds are formed through the overlapping of p-orbitals, which lie perpendicular to the bonding axis.
In organic chemistry, pi bonds are commonly seen in double bonds and triple bonds between carbon atoms. These involve the overlap of p-orbitals and are formed by the side-to-side overlap of two parallel p-orbitals.
On the other hand, d-orbitals are larger and have a different shape compared to p-orbitals. They are involved in forming sigma (σ) bonds rather than pi bonds. Sigma bonds are formed by the direct overlap of orbitals along the bonding axis and are typically formed by the overlap of hybridized orbitals, such as sp, sp2, or sp3 hybrid orbitals.
So, while d-orbitals play an important role in forming sigma bonds, they are not involved in the formation of pi bonds.