Practice question
Question
A compound with C₄H₈O gives a negative Lassaigne’s test for halogens and contains a carbonyl group. What functional group is present?
Explanation
CH₃CH₂CH₂CHO (butanal, aldehyde) fits C₄H₈O, has a carbonyl, and no halogens, consistent with a negative Lassaigne’s test.
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