Which of the following compounds will show reverse hyperconjugation?
A
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B
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C
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D
All the above
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Solution
The correct option is A Reverse hyperconjugation does not occur in the presence of α−Hydrogens. In option (b), we have 1 α−Hydrogen and in option (c) we have 2 α−Hydrogens. In option (a), we have no α− Hydrogens but rather α− halogens, Hence option (a) shows reverse hyperconjugation.