do all ketones give a positive iodoform test?

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gucciglomerulus
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#1
Report Thread starter 11 months ago
#1
I know the iodoform reaction only identifies the presence of a methyl ketone with the CH3C=O group.
Does this mean every ketone gives a positive test or only a ketone with the C=O carbonyl group on the 2nd carbon of the chain?
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BobbJo
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Report 11 months ago
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Only ketones with CH3CO group. There needs to be CH3CO, i.e a methyl group adjacent to the (C=O) ketone group

Alcohols with CH3CH(OH) group also give positive iodoform test because they are oxidised by I2 to CH3CO
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gucciglomerulus
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Report Thread starter 11 months ago
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so ketones such as CH3CH2COCH2CH3 would give a negative test?
(Original post by BobbJo)
Only ketones with CH3CO group. There needs to be CH3CO, i.e a methyl group adjacent to the (C=O) ketone group

Alcohols with CH3CH(OH) group also give positive iodoform test because they are oxidised by I2 to CH3CO
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BobbJo
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#4
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(Original post by gucciglomerulus)
so ketones such as CH3CH2COCH2CH3 would give a negative test?
yes
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