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. Explain how the results of X-ray diffraction experiments on benzene suggest a delocalised structure rather than the Kekulé structure. (2) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................

Chemistry

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

Answer:

An explanation that makes reference to the following points:
- (the x-ray diffraction shows) the bonds are the same length

(1)

Either
- (therefore) electrons are evenly distributed (around the benzene ring)

(1)

Or
- Kekule structure would have shorter double bonds / longer single bonds

(1)

Answer:

Knowledge points:

Solution:

Answer:

Knowledge points:

Solution:

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