Figure 2.

From

Why Cyclohexatriene (C6H6, pKa = 43) is Less Acidic than Cyclopentadiene (C5H6, pKa = 15) and Cycloheptatriene (C7H8, pKa = 36): A Freshmen Chemical Education Undergraduate Exercise

Sanjeev Rachuru, Devarakonda A. Padmavathi, V. Jagannadham

World Journal of Chemical Education. 2023, 11(1), 1-3 doi:10.12691/wjce-11-1-1