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The object of this investigation was to get replies to the following questions concerning the structure of certain simple benzene derivatives in the vapour phase:— (1) Is the benzene ring a flat, regular hexagon? (2) What is the carbon-carbon distance in the benzene ring, and is this a constant independent of the number of substituents ?

Molecular structure as determined by a new electron diffraction method II—The halogen-carbon bond distance in some simple benzene derivatives