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Question
Why Methyl Alcohol does not form Iodoform? Explain with reason.
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Solution
Iodoform ( in general haloform) reaction is given by ketones having methyl group attached to carbonyl carbon.
The group CH3−C|| O − is called methyl keto group. Any compound that can be oxidized to a methyl ketone, also gives haloform reaction.
Thus ethyl alcohol CH3−CH2−OH can be oxidized to acetaldehyde CH3−C|| O −H which contains methyl keto group. Hence, ethyl alcohol, can give haloform reaction. But, methyl alcohol CH3−OH does not form Iodoform as methyl alcohol cannot be oxidised to a compound containing methyl keto group as methyl alcohol has only one C atom.
The group CH3−C|| O − is called methyl keto group. Any compound that can be oxidized to a methyl ketone, also gives haloform reaction.
Thus ethyl alcohol CH3−CH2−OH can be oxidized to acetaldehyde CH3−C|| O −H which contains methyl keto group. Hence, ethyl alcohol, can give haloform reaction. But, methyl alcohol CH3−OH does not form Iodoform as methyl alcohol cannot be oxidised to a compound containing methyl keto group as methyl alcohol has only one C atom.
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