ochem 3rd test 2004 key

ochem 3rd test 2004 key - CHEMISTRY 314-01 MIDTERM # 3...

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CHEMISTRY 314-01 MIDTERM # 3 – answer key March 11, 2004 Statistics: Average: 69 pts (69%); Highest: 95 pts (95%); Lowest: 36 pts (36%) Number of students performing at or above average: 20 (54%) 1. (6 pts) Mark as true ( T ) or false ( F ) the following statements. Do not explain! ( F ) Acetals decompose quickly in basic conditions; ( T ) Aldehydes are more reactive than ketones in nucleophilic addition reactions; ( T ) Acetals are formed only in the presence of acid catalyst; ( F ) The products of reaction of carbonyl compounds with hydroxylamine are called hydroxylimines; ( T ) β -dicarbonyl compounds are more acidic than monocarbonyl compounds; ( T ) The haloform reaction requires basic conditions; 2. Circle ALL that apply: A. (3 pts) The follwing reactions follow an addition – elimination mechanism: a. Formation of hemiacetals; b. Formation of cyanohydrins; c. Formation of hydrates; d. The Wittig reaction; B. (3 pts) Hemiacetals are: a. Decomposed to carbonyl compounds in acidic conditions; b. Decomposed to carbonyl compounds in basic conditions; c. Converted to acetals in acidic conditions; d. Converted to acetals in basic conditions; C. (3 pts) The following reactions DO NOT lead to formation of carbon – carbon double bonds: a. Aldol condensation; b. Wittig reaction; c. Baeyer – Villiger oxidation; d. Michael addition; D. (3 pts) Halogenation of aldehydes or ketones in acidic conditions: a. Occurs through enolate anions; b. Is independent of the concentration of halogen; c. Is independent of the type of halogen; d. Leads to introduction of a single halogen atom; 3. (5 pts) Provide the correct structure, matching each of the following names:
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ochem 3rd test 2004 key - CHEMISTRY 314-01 MIDTERM # 3...

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