AdGif UNREGIST Kekule Structure Proposed in 1866 by Friedrich Kekule,shortly after multiple bonds were suggested. Failed to explain existence of only one isomer of 1,2-dichlorobenzene. all C-C bond double bond lengths 1.397 A 1.34A single bond 1.48A resonance representation bond order=l号 butadiene combined representation Copyright 2010 Pearson Prentice Hall,Inc.Kekulé Structure Proposed in 1866 by Friedrich Kekul é, shortly after multiple bonds were suggested. Failed to explain existence of only one isomer of 1,2-dichlorobenzene