old Exam 2 - 1. Circle the correct answer: (50 pts) (1) The...

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2 1. Circle the correct answer: (50 pts) (1) The hybridization of the carbon of a carbonyl group is a. sp 2 . b. sp 3 . c. sp. d. s 2 p 3 . e. s 3 p 2 . Answer: a (2) In the proton NMR spectra aldehydes and ketones, the protons bonded to carbons adjacent to the carbonyl group typically fall into which chemical shift ranges below? a. 1.0 - 2.0 ppm. b. 2.0 – 3.0 ppm. c. 4.0 – 4.5 ppm. d. 7.0 – 8.0 ppm. e. 9.0 – 10.0 ppm. Answer: b (3) To form acetals, aldehydes and ketones need to be treated with alcohols under acidic conditions because: a. they are more likely to isomerize. b. these conditions are favorable. c. the cabonyl oxygen atom needs to be protonated to become more electrophilic. d. to keep other side reactions from happening. e. they are more soluble under these conditions. Answer: c (4) Where in the infrared spectrum would you find a strong absorption band representing the stretching frequency of the C=O group of simple aldehydes and ketones? a. near 1710 cm -1 b. near 1490 cm -1 c. near 810 cm -1 d. near 3000 cm -1 e. near 3450 cm -1 Answer: a (5) The Wittig reaction is most useful for:
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This note was uploaded on 11/10/2010 for the course CHE 201 taught by Professor Bong during the Spring '08 term at SUNY Buffalo.

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old Exam 2 - 1. Circle the correct answer: (50 pts) (1) The...

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