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Functional Group Questions

Functional Group Questions - Agustin Garcia Functional...

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Agustin Garcia 02/08/11 Functional Groups 1. A functional group is the atom or group most responsible for a compound’s chemical reaction under certain conditions (Carey, Organic Chemistry). 2. Infrared Absorptions a. (Alcohol) 2850-2800 b. (Alkene) 3100-3010 c. (Carboxylic Acid) 3400-2400 d. (Ketone) ~1715 e. (Alkyl Halide)785-540 f. (Aldehyde) ~2850 3. The orange precipitate when reacted with 2, 4 DNP indicates that it could be either an Aldehyde or a Ketone. The negative test result on the Tollen’s test indicates that it is a Ketone. Ketones generally have a wavelength of ~1715. 4. Unknown code was MNE. MNE was insoluble in water and in both 5% NaOH and 5% HCl. The unknown was a ketone functional group because when 2, 4 DNP test was performed, a brick red precipitate was formed. Tollen’s test was performed and provided negative result. No peak was identified at 1700/2700 cm- 1, meaning it could not be an aldehyde. 5. The 2, 4 DNP test indicated that it was a carbonyl functional group instead of an Alkene or alcohol. The tollen’s test had a negative result, as it had no reaction,
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