CHE 233 Final Exam Questions With Complete Solution

Unsaturated fatty acids ______________. correct answer: have one or more C=C saturated fatty acids _________________. correct answer: do not have ANY C=C bonds, only C-C. what ways is biodiesel produced commercially? correct answer: * base catalyzed transesterification of the oil with methanol (what we used) * acid catalyzed esterification of the oil with methanol *saponification of the oil to yield free fatty acids, then acid catalyzed esterification FAME stands for: correct answer: Fatty Acid Methyl Esters NMR stands for: correct answer: nuclear magnetic resonance The limiting reagent in the biodiesel ex. was: correct answer: triglyceride the excess reagent in the biodiesel ex. was: This shifts the equilibrium to the _________. correct answer: methanol; right. the addition of water to sodium methoxide produces ________ and ____________. correct answer: NaOH and methanol how was the biodiesel lab characterized? correct answer: 'H-NMR. Looking for prominent peak from -OCH3, singlet, and disappearance of peaks from triglycerides How is le-Chatelier's principle applicable to the transesterification reaction in the preparation of FAMEs? correct answer: alcohol in excess will shift the equilibrium to the products and increase product yield. what is the purpose of base in the aldol condensation reaction? correct answer: it is a base-catalyzed reaction, so sodium hydroxide wills acidic alpha-hydrogen to produce a nucleophilic enolate anion hexynide lithium reacts with 6,13-pentacenequinone via: correct answer: nucleophilic addition to carbonyl T/F: The tin (II) chloride in the synthasis of pentacene derivatice works as an oxidizing agent correct answer: False, it works as a