CHE201B - Exam 1 2005 Answer

CHE201B - Exam 1 2005 Answer - (I Write one example of each...

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(I) Write one example of each of the following (3 pts each). (1) An n- pentyl group. CH 2 CH 2 CH 2 CH 2 CH 3 1 2 3 4 5 (2) An alkane that contains only secondary carbon atoms. (3) The conjugate base of acetic acid (CH 3 COOH). (4) A molecule which contains an sp 3 hybridized oxygen. For example, H 2 O (5) A molecule which contains an sp hybridized nitrogen. For example, or any other unsubstituted moncyclic ring CH 3 O O CH 3 C N
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2 2 (6) A primary carbocation. (7) A termination reaction in free radical halogenation. Any reaction that removes radicals from the chain process. (8) A compound with a bicyclic ring. For example: (9) A tertiary radical. For example, (10) The boat form of cyclohexane. R C H H CH 3 C CH 3 CH 3
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3 3 (II) (A) Fill in the boxes to indicate the hybridization state of the labeled heavy atoms (3 pts each). O CH 2 C C H H CH 2 C H O sp 2 sp 2 sp 3 sp sp 2 (B) For each of the following: (i) Circle the contributing valence bond resonance structure that makes the largest contribution to the observed structure of the molecule (2 pts each).
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