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Identification of an organic unknown There are many different chemical tests, which enable us to identify an unknown compound. The only thing known about the compound is that it contains one of the following functional groups: alcohol, aldehyde, ketone, carboxylic acid, phenol or ester. I devised a sequence of tests that would identify which of the groups the sample contains. Initially I worked out what tests there are for each functional group, and decided which one to use on the basis that each test should be dependent on the result of the previous test, which helped me to arrange the sequence. Method Test for presence of alcohol: An oxidation reaction must take place. Mix equal volumes (3cm3) of dilute sulphuric acid and potassium dichromate solution. Then add the same volume of the unknown to it. If the solution turns from orange to green then a primary or secondary alcohol group is...

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