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Treatment of cyclopentanone with methyl lithium gives which of the following species?

1. Cyclopentanoyl cation
2. Cyclopentanoyl radical
3. Cyclopentanoyl biradical
4. Cyclopentanoyl anion

Correct answer: Cyclopentanoyl cation

Solution

Treatment of cyclopentanone with methyl lithium results in the formation of a cyclopentanoyl cation.

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