Practicing Success
Which of the following will not give iodoform test? |
ethanal benzyl alcohol ethanol isopropyl alcohol |
benzyl alcohol |
The iodoform test is a chemical test used to detect the presence of methyl ketone or acetaldehyde. The test is based on the oxidation of the compound to form a triiodomethane (iodoform) precipitate. The compounds that will give a positive iodoform test are those that contain a methyl ketone group \((CH_3CO-)\) or acetaldehyde \((CH_3CHO)\). Ethanol \((CH_3CH_2OH)\) can also give a positive iodoform test, because it can be oxidized to acetaldehyde. Benzyl alcohol \((C_6H_5CH_2OH)\) does not contain a methyl ketone group, so it will not give a positive iodoform test. Here is a table of the compounds and their expected results with the iodoform test:
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