Which orbitals form a pi bond?

A. the s orbital and three p orbitals

B. the s orbital and two p orbitals

C. overlapping p orbitals

D. overlapping hybrid orbitals

C. overlapping p orbitals

Explanation:

The atoms which comprises of single bond is formed by sigma bond. Sigma bond is formed by the internuclear overlapping of the atomic orbitals. They are formed due to the head on overlapping of the atomic orbitals. Since, the bond is symmetrical about the internuclear axis, it can rotate without the breakage of the bond.

On the other hand, double or triple bonds contains one or two pi bonds respectively along with one sigma bond. Pi bonds are formed by the sideways overlapping and thus they are non-symmetrical about the internuclear axis and thus it breaks if the bond is being rotated.

Thus the answer is: - C. overlapping p orbitals