ANSW_KEY_PROB_SET_1 - CEM 351 Fall 2008 - Prof. Rathke -...

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CEM 351 Fall 2008 - Prof. Rathke -- Answers -- 1st Sample Problem Set (Chapters 1, 2, 3, 4, 5) 1. a) 7 b) 3 c) 1 d) Sp e) Sp 2 f) 28 g) 4 h) C 11 H 14 BrNO 2. CH 2 N N -1 +1 0 3. a) Carbocation: (Zero electrons on central carbon) Carbon radical: (one electron on central carbon) Carbanion: (two electrons on central carbon) b) There are three σ bonds on the central atom in all cases. 4. How many of the methyl groups will occupy an equatorial position in the more stable chair conformation of the following molecules? Which configuration should be most stable of the four? CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 I II III IV a,a,e,e a,a,a,a a,a,e,e a,e,e,e e,e,a,a e,e,e,e e,e,a,a e,a,a,a (2) (4) (2) (3) II is most stable.
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CEM 351 - Dr. Rathke, Fall 2008 – Answers to 1 st Sample Problem Set. ... page 2 5. H CH 3 CH 3 H H CH CH 3 CH 3 CH 2 CH 2 CH 2 CH 3 C 2 C 3 a) CH 2 CH 2 CH 3 H CH 3 H CH 3 CH 2 H H CH 2 CH 3 H H CH 3 b) H H CH 2 CH 3 H H CH 3 H H H H c) d) CH 3 H CH 3 H H CH 3 H CH 3 x 6. a) conformational isomers b) configurational isomers c) constitutional isomers d) identical e) conformational isomers f) identical Which of the following olefins possess configurational isomers?
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ANSW_KEY_PROB_SET_1 - CEM 351 Fall 2008 - Prof. Rathke -...

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