CHEM 203 Exam 2. Name Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.
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1 CHEM 203 Exam 2 Name Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. What is the IUPAC name of 5-ethyl-2,3-dimethyl-6-hexanol 2-ethyl-4-isopropyl-1-pentanol c. 2-ethyl-4,5-dimethyl-1-hexanol 2. In diols and triols the hydroxyl groups are never attached to the same carbon atom. Given this condition how many isomers of butanetriol exist? 1 2 c. 3 d Which of the following compounds will have the highest boiling point? 1-butanol ethanol c. 1- pentanol d. 1-propanol 4. Which of the following compounds is most soluble in water? 1-butanol 1-hexanol c. 1- pentanol d. 1-propanol 5. The hydration of alkenes and the dehydration of alcohols are a pair of competing reactions which establish an equilibrium. Which of the following statements properly describes the relationship between the hydration of alkenes and the dehydration of alcohols? the amount of water present does not affect the relative amounts of the alkene and the alcohol in the reaction mixture there will always be equal amount of the alkene and the alcohol c. the presence of large amounts of water favors the formation of alcohols d. the presence of large amounts of water favors the formation of alkenes
2 6. Which of the following compounds are obtainable by the oxidation of primary alcohols? carboxylic acids ketones 7. Which of the following is a synonym for thiol? mercaptan sulfate c. sulfide d. sulfoxide 8. Which of the following types of isomers must possess a stereocenter? cis-trans isomers constitutional isomers 9. Which of the following molecules is(are) chiral? 1-pentanol 2-pentanol c. 3-pentanol d. all of them 10. Which of the following molecules is(are) achiral? 2-methylhexane 3,3-dimethylhexane c. 3-ethyl-3-methylhexane d. all of them 11. Which of the following molecules is achiral? 2,3,4-trimethylheptane 3,4,5-trimethylheptane c. 2,4,6-trimethylheptane d. none of them 12. Which of the following molecules has an R configuration?
3 13. Some molecules with multiple stereocenters are achiral. Which of the following molecules is(are) achiral? 14. Which of the following bonds is found in all amines? C N H N c. C=N d. both (a) and (b) 15. How many hydrogen atoms are attached to a nitrogen atom in a tertiary amine? 0 1 c. 2 d What is the IUPAC name of butylamine 1-butanamine c. 4-butanamine
4 17. What is the IUPAC name of N-methylaniline N-methylcyclohexanamine c. cyclohexylmethylamine 18. Which of the following gives the correct order of solubility in water? aniline > methylamine > trimethylamine aniline > trimethylamine > methylamine c. methylamine > trimethylamine > aniline d. methylamine > aniline > trimethylamine 19. What is the minimum number of carbon atoms present in a ketone? 1 2 c. 3 d What is the IUPAC name of o-methylbenzaldehyde o-methylcyclohexanal c. 2-methylcyclohexanal 21. What is the name of cyclohexene-2-one cyclohexene-3-one c. 2-cyclohexenone d. 3-cyclohexenone
5 22. For compounds of comparable molecular mass which of the following gives the correct order of boiling points? alcohols < aldehydes < alkanes aldehydes < alcohols < alkanes c. aldehydes < alkanes < alcohols d. alkanes < aldehydes < alcohols 23. What reagent is most commonly used in the laboratory reduction of aldehydes? hydrogen atoms hydrogen molecules c. aquous acidic sodium borohydride d. a transition metal hydride 24. Which of the following is obtained by the reduction of 3-pentanone? pentanal 3-pentanol c. pentanoic acid 25. Which of the following compounds is most likely to form a stable hemiacetal? c. d. 26. Which of the following molecules can show keto-enol tautomerism?
6 27. Which of the following is butanoic acid? CH 3 CH 2 COOH CH 3 (CH 2 ) 2 COOH c. CH 3 (CH 2 ) 3 COOH d. CH 3 (CH 2 ) 4 COOH 28. What is the name of 5-amino-2-ethylhexanoic acid 2-amino-5-ethylhexanoic acid c. 2-amino-5-methylheptanoic acid 29. Which of the following is the strongest carboxylic acid? ClCH 2 COOH Cl 2 CHCOOH c. Cl 3 CCOOH d. they are all equally strong 30. What is the common name of methyl acetate methyl ethanoate c. ethyl methanoate d. ethyl acetate 31. What reagents can be used to prepare acetic acid and methanol formic acid and methanol c. acetic anhydride and water 32. What is the formula of triphosphoric acid? H 4 P 3 O 6 H 4 P 3 O 10 c. H 5 P 3 O 6 d. H 5 P 3 O 10
7 33. What type(s) of esters can be formed by phosphoric acid? monoesters diesters c. triesters d. all of these 34. Lactomer, the polymer in absorbable stitches, is an example of what type of polymer? a polyamide a polycarbonate c. a polyester 35. Which of the following reagents can be used to prepare a polyamide? a difunctional acid and an difunctional alcohol a difunctional alcohol and a difunctional ester 36. Label the chiral carbons in the molecules below with an asterisk (*). If a molecule has no chiral carbons, write None below it. Caution: Incorrect labels cancel correct ones if both are present! However, if a negative score results, it will not be recorded. (5 points total) Cl OH Cl c. 37. For each of the reactions below, write the structure of the major organic product. Note: These reaction are not balanced. Assumer all reagents to be present sufficient for the reaction. (2 points each) O + NaBH 4 + H 2 O CHO + KMnO 4
8 37. (cont.) c. OH + CH3 CH 2 OH H 2 SO 4 (cat.) O d. N + HCl e. O OH + NH 2
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