09_mid_266_v1_ans

09_mid_266_v1_ans - Name: _ ID Number: _ Chemistry 266...

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Name: __________________________ ID Number: ______________________ Chemistry 266 Midterm Test 2009 (Test Master 1) 1. Which of the following pairs of structures are valid resonance structures of each other? N O O O H i OC H 2 H 3 C and H 2 H 3 C ii and N O O O H iii CH 2 H 3 C and 2 H 3 C 2 H 3 C 10 electrons n o nitrogen shoul b d e 26% A i and iii B ii and iii C i, ii and iii Answer D 61% D i only 2. For the following compound, the hybridizations of the atoms labeled 1 and 2 are best described as: A 1, sp 2 and 2, sp 3 90% B 1, sp and 2, sp 3 C 1, sp 2 and 2, sp 2 Answer B D 1, sp and 2, p 3. Many compounds contain more than one functional group. For the following molecule, the functional groups present are: H 3 C O C 3 3 O 2 OH O ester ketone alcohol A alcohol, carboxylic acid, and ketone 89% B alcohol, ester, and ketone C aldehyde, carboxylic acid, and ester D alcohol, aldehyde, and ketone
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Answer B 4. For the following pairs of structures, which one of the pair will be the more major contributor to the overall resonance hybrid? O O O O H 2 NC H 2 H 2 H 2 12 34 56 Major contributor negative charge on more electronegative atom Major contributor no charge separation Major contributor full octets 29% A 1, 3, 5 B 2, 4, 6 Answer C 61% C 1, 3, 6 D 2, 3, 5 5. Predict the shape of the follow species (count any lone pairs as substituents in your shape analysis): BF 4 , + CH 3 , + NH 4 A all are tetrahedral B BF 4 , trigonal planar; + CH 3 , trigonal planar; + NH 4, tetrahedral 90% C BF 4 , tetrahedral; + CH 3 , trigonal planar; + NH 4, tetrahedral D BF 4 , tetrahedral; + CH 3 , trigonal planar; + NH 4, square planar B F F F F N H H H H HC H H Answer C 6.
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This note was uploaded on 11/14/2010 for the course CHEM CHEM266 taught by Professor Forsey during the Fall '10 term at Waterloo.

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09_mid_266_v1_ans - Name: _ ID Number: _ Chemistry 266...

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