Intro: In this lab, you will identify an unknown aldehyde or ketone using a combination of physical and chemical methods. Functional Groups: Carbonyls represent a class of compounds that possess a C=O double bond. In order to interpret many of the tests in this lab, you will need to be able to identify a variety of carbonyl-based functional groups. Identify the carbonyl-based functional groups in the molecules below by checking the indicated one functional group boxes. Some molecules may possess more than from the list. 0 aldehyde ketone methyl ketone carboxylic acid carboxylate hydrazone semicarbazone Chemical Tests: In this lab, you will perform a variety of chemical tests. In each test, a positive result testifies to presence of one or more possible functional groups. . Iodoform Test: A tests positive in the iodoform test (see below, a). In a positive iodoform test, a yellow solid precipitates from the reaction mixture. In the equation below a. b. c. Circle the species that corresponds to the yellow precipitate. What is the name of the species? Would you expect B (below) to give a positive iodoform test? Explain briefly Circle One: Yes NoExplain: KI, I 2. Chromic Acid Test: A tests positive in the chromic acid test (see below, a). A chromic acid test relies on the fact that chromium has different colors at different oxidation states. OhH Cr(ll) (reduced chromium) In the boxes provided above, indicate the color of the original chromic acid solution (higher oxidation state chromium) and the lower oxidation state chromium formed in a successful test. a.