Question

how many π bonds are present in the structure of ibuprofen shown?

Explanation:

Step1: Analyze double bonds

Each double bond contains one π bond. In the ibuprofen structure, there is a carbon - oxygen double bond (\(C = O\)) in the carboxylic acid group and three double bonds in the benzene ring.

Step2: Count π bonds

The \(C = O\) double bond contributes 1 π bond. The benzene ring, which has three double bonds (in its Kekulé structure representation), contributes 3 π bonds. So in total, \(1 + 3=4\) π bonds.

Answer:

4