The planar regular hexagonal structure of benzene was first proposed by

Answer

3

Explanation

Kekule (1865) was the first to suggest a ring structure for benzene In 1861 the austrian chemist J.J. Loschmidt represented the benzene ring with a circle but he made no attempt to indicate how the C atoms were actually arranged in the ring. Dewar (1867) suggested a number of formulas for benzene one being Ladenburg proposed the prism formula for benzene.