Which structural feature is required for a compound to give a positive yellow precipitate in the iodoform (triiodomethane) test?
Answer and explanation
Correct answer: C. Methyl carbonyl group or methyl carbinol group
The iodoform test gives a bright yellow crystalline precipitate of CHI3 with compounds containing a methyl carbonyl group (such as ethanal or methyl ketones like acetone) or secondary alcohols that can be oxidized to methyl ketones (such as ethanol or propan-2-ol).
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