In 1865, Friedrich August Kekulé suggested a structure for benzene which consisted of alternating single and double carbon-carbon bonds. However, modern analytical techniques indicate a structure in which the electrons are delocalised. The compound 1,2-dichlorobenzene exists as only one structure. Explain how this supports the delocalised structure of benzene rather than the Kekulé structure. (2) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................

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Exam No：wch15-01-que-20240113 Year：2024 Question No：13(b)

Answer:

An explanation that makes reference to the following points:
- because a Kekulé structure would have two isomers / two different structures

(1)
- one with the chlorines attached to carbons with a single bond between them and one with a double bond between them

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