Assignment_4_Answers

Assignment_4_Answers - CHM 1321 Assignment 4 Answers 1)...

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CHM 1321 Assignment 4 Answers 1) Draw the important resonance forms and show the resonance hybrid structures for the following: H 3 C C CH 3 O (a) H 3 C C 2 O (b) (c) H 3 C C NH 2 H 3 C C 3 O H 3 C C 3 O H 3 C 3 O δ δ + H 3 C C 2 O H 3 C C 2 O H 3 C 2 O δ δ + H 3 C C 2 O δ O H 3 C C 2 O H 3 C C 2 O H 3 C C 2 O H 3 C C 2 O δ δ + δ + (d) H 3 C C C H 2 OH 3 H 3 C C C H 2 O H 3 C C C H 2 O H 3 C C H 2 O δ+ δ + H H H 3 3 3
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Assignment 4 - Answers 2 (e) (f) (g) H 2 CCH 2 CH S H 2 C HC HC C H C H C CH 2 H 2 2 S H 2 C H 2 2 C S H 2 C H 2 2 C S H 2 C δ + δ + HC C H C H C 2 C H CH C H C 2 HC HC C H C H C 2 C H C H C 2 C H C H C CH 2 C H C H C CH 2 δ - δ - δ - δ - HC HC C H C H C 2 C H CH C H C CH 2 HC HC C H C H C 2 C H C H C 2 HC HC C H C H C 2 δ + δ + δ + δ + H H
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Assignment 4 - Answers 3 H 3 C C O O H 3 C C O O H 3 C C O O H 3 C N O O δ δ + δ + (h) N CH 3 H 2 C CH 3 (i) CH 3 NO 2 (j) CH 3 COOH H H H H 3 C N O O H 3 C N O O H 3 C C O O δ δ + δ + H N CH 3 H 2 C CH 3 octets full - no resonance possible
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Assignment 4 - Answers 4 2) For the following resonance forms, label the major and minor resonance forms, and show which ones are of equal energy. Justify your choices. H 3 C H C CN H 3 CC H (a) (b) H 3 C C C H O H C CH 3 H 3 C C C H O H C CH 3 H 3 C C C H O H C 3 (c) H 3 C C C H C H 2 CH 3 O O H 3 C C C H C C H 2 3 O O H 3 C C C H C C H 2 3 O O (d) H 3 C H 2 C C NH 2 NH 2 H 3 C H 2 C C 2 2 H 3 C H 2 C C 2 2 All atoms have a full Octet. In the second structure, the negative charge is located on the more electronegative atom. Major Minor Major In the Major resonance structure, all atoms have a full octet. In the minor and intermediate resonance forms, one carbon is lacking an octet. In the intermediate structure has less separation between opposite charges than does the minor structure. Major Major All atoms in all structures have a full octet. In the Major (2 equivalent) resonance forms, the negative charge resides on the more electronegative oxygen atom. In the Minor resonance form, the negative charge resides on the less electronegative carbon. Minor In the Major (2 equivalent) resonance forms, all atoms have an octet (this criterion overides having a positive charge on a more electronegative atom).
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Assignment_4_Answers - CHM 1321 Assignment 4 Answers 1)...

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