iodoform test in alcohol
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This page looks at how the triiodomethane (iodoform) reaction can be used to identify the presence of a CH3CH(OH) group in alcohols.
Note: This reaction can also be used in testing for the CH3CO group in aldehydes and ketones. You will find a link to this at the bottom of the page.
Doing the triiodomethane (iodoform) reaction
There are two apparently quite different mixtures of reagents that can be used to do this reaction. They are, in fact, chemically equivalent.
Note: It would be silly to learn both of these methods. Use whichever one your examiners want - find out by looking at past papers and mark schemes. If you haven't got these, go to the syllabusespage to find out how to get hold of them.
We will take the reagents as being iodine and sodium hydroxide solution.

This is being given as a flow scheme rather than full equations. You aren't likely to need the equation for the oxidation stage for UK A level purposes. The equations for the other two steps are given on a page about reactions of aldehydes and ketones. Follow the first link below if you are interested.
Note: This reaction can also be used in testing for the CH3CO group in aldehydes and ketones. You will find a link to this at the bottom of the page.
Doing the triiodomethane (iodoform) reaction
There are two apparently quite different mixtures of reagents that can be used to do this reaction. They are, in fact, chemically equivalent.
Note: It would be silly to learn both of these methods. Use whichever one your examiners want - find out by looking at past papers and mark schemes. If you haven't got these, go to the syllabusespage to find out how to get hold of them.
We will take the reagents as being iodine and sodium hydroxide solution.

This is being given as a flow scheme rather than full equations. You aren't likely to need the equation for the oxidation stage for UK A level purposes. The equations for the other two steps are given on a page about reactions of aldehydes and ketones. Follow the first link below if you are interested.
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