## Chemistry 9th Edition

There are 33 $\sigma$ and 9 $\pi$ bonds.
Based on the diagram given, indigo consists of 33 bonds, 9 of which are double bonds and the rest single bonds. Because every single bond is a $\sigma$ bond, and every double bond consists of 1 $\sigma$ and 1 $\pi$ bond, adding the bond counts gives a total of 33 $\sigma$ and 9 $\pi$ bonds.