pratical 7 properties of aldehydes and ketone discussion.docx

Pratical 7 properties of aldehydes and ketone discussion.docx

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Discussion The first experiment is chromic acid test. In this experiment, the chromic acid is used to differentiate aldehyde group and ketone group. Chromic acid is a strong oxidizing agent which can oxidized alcohol and aldehyde group to form carboxylic acid whereas ketone cannot. The colour changes from orange solution to greenish-blue solution is showed the positive test. The chromic acid will reduce from Cr 6+ to Cr 3+ undergo reduction process. The presence of benzylic position will contain hydrogen atoms and the methyl ketone is remained unchanged while the other groups is oxidized. Hence, the chromium oxidation of acetophenone to a carboxylic acid is slower than alkyl benzylic oxidation. Acetophenone, benzaldehyde, 3-pentanone, unknown A and unknown B were showed negative test which formed the dark brown precipitate after added chromic acid and no bubbles are produced during the reaction. Acetophenone showed the negative result because it doesn’t have benzylic hydrogens . Isopropyl alcohol, 1-propanol were showed positive
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  • Fall '16
  • Redox, Aldehyde, Acetophenone, Unknown A

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