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Chemistry 140CQuiz1 - Chemistry 140C Quiz 1 Winter...

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Unformatted text preview: Chemistry 140C Quiz 1 Winter 2011 Your Name (Please Print) ________________________________________________ Your Section (Assigned) _______ Your Student ID# ________________________________________________ Question 1: Why are conjugated unsaturated aldehydes and ketones more stable than the unconjugated isomers? a. They aren’t; rather, the unconjugated isomers are more stable. b. Because of localized pi bonding. c. Because they can have only one primary resonance form. d. They are stabilized by resonance. Question 2: What functionality must a molecule possess to undergo an intramolecular aldol condensation? a. An aldehyde and a hydroxy. b. A ring structure. c. Two aldehydes. d. A ketone and an aldehyde. Question 3: What does the acid catalysed halogenation of a ketone produce? a. A polyhalogenated ketone, with all halogens alpha to the carbonyl. b. A halogenated ketone alpha to the carbonyl. c. An alkyl halide. d. Multiple halogenations, usually symmetrically, on both positions alpha to the carbonyl. Question 4: To what does the term “tautomerization” refer? a. The interconversion between a ketone and an alkene. b. The interconversion between an alcohol and an alkene. c. The conversion of a ketone between its enol and alcohol form. d. The conversion of an enol between its alcohol and keto form. Question 5: What is a hemiacetal? a. The product of the addition of two alcohols. b. The product of an aldehyde and a ketone addition. c. A molecule in which one carbon has two  ­OR groups bonded to it. d. A molecule in which one carbon has an  ­OR bonded to it as well as an  ­OH group. Question 6: Please draw a reasonable mechanism for the formation of an acetal from an aldehyde. Question 7: Please draw the structure of an enamine. ...
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