Practice exam 202 -sp2010-1

Practice exam 202 -sp2010-1 - Chemistry 202 Practice Lab...

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Chemistry 202 Practice Lab Exam – SP 2010 - Page 1 Your Name (Print) Person # ________ - ______________ TA/Day of Lab _________________________ Indicate the BEST answer to each question by putting an X in the corresponding box below. Only answers in the grid below will be graded. Any marks on the rest of the exam will be ignored. You will NOT be given the option later to request a re-grade based on the answers you intended to mark! Each question is worth 2 points (2 x 35 = 70 points maximum score) 1. In Exp 32 (Diels-Alder), one only gets a maximum 50% yield from the eucalyptus oil. Why? (A) the reaction is not pushed to full convergence (B) only half the starting material is in the s-cis diene configuration (C) half of it evaporated during reflux (D) the molecular weight of the starting material is wrong 2. Which of the following structures is consistent with the IR spectra shown below? A) OH (B) O (C) COOH D) N 3. If you reacted 10 moles of isopentyl alcohol with an excess of acetic acid, how many grams of isopentyl acetate (MW=130.2 g/mol) would you have if the yield was 75 % ? (A) 1302g (B) 1.302g (C) 881g (D) 976.5g 4. Why is it essential to avoid a wet conical vial when adding phenylmagnesium bromide? (A) water makes a ketal with benzophenone (B) the product is soluble in water (C) it is not essential to have a dry conical vial (D) Phenylmagnesium bromide reacts with water 5. The nitration of naphthalene involves what type of reaction? (A) nucleophilic aromatic substitution (B) electrophilic aromatic substitution (C) nucleophilic acyl substitution (D) Friedel-Crafts acyl substitution 6. The key reactive intermediate in a Wittig Reaction is (A) the enolate ion (B) the phosphorous ylide (C) the trans-alkane (D) triphenylphosphine 7. Identify the MAJOR product “X” in the reaction below 50 % NaOH O H CH 2 PPh 3 + X A )B )C ) D) 8. What are the required conditions for the diazotization step in the synthesis of azo dyes? (A) low temperature (B) excess of starting materials (C) basic environment (D) presence of phenols
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Chemistry 202 Lab Exam - Monday, April 20, 2009 - Page 2 9. In the synthesis of DEET, why is m-toluic acid first converted to m-toluoyl chloride (A) The acyl chloride is less harmful to work with than the carboxylic acid
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Practice exam 202 -sp2010-1 - Chemistry 202 Practice Lab...

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