Exam 1 Practice Problems and Keys

Exam 1 Practice Problems and Keys - Chem 240 Practice...

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Unformatted text preview: Chem 240 Practice Problems Exam 1 Nomenclature Isomers Rotational Energy Diagrams Free Radical Halogenation Hybridization Sigma and Pi bonds Boat Chair Configurations Intermolecular Forces Polarity and Dipoles Resonance Structures Analysis of Dimethylcyclohexane Using Chem3D Pro All Values in kJoules Cis 1, 2 Trans 1, 2 Cis 1, 3 Trans 1, 3 Cis 1, 4 Trans 1, 4 Configuration Chair Twist Boat Cis 1, 2 10.0625 ae (ea) 15.5686 ae 14.5466 ea Trans 1, 2 8.4625 ee 10.8828 aa 13.7837 ee 14.8823 aa Cis 1, 3 12.5163 aa 7.2137 ee 13.1638 ea 15.5673 ae Trans 1, 3 9.0089 ae (ea) 12.6898 ee 17.0596 aa Cis 1, 4 8.9816 ae (ea) 13.6264 ee 13.6105 aa Trans 1, 4 10.7757 aa 7.2161 ee 13.6442 ae (ea) CH 3 H 3 C H 3 C CH 3 H 3 C H 3 C H 3 C H 3 C CH 3 H 3 C H 3 C CH 3 H 3 C H 3 C H 3 C H 3 C CH 3 CH 3 CH 3 CH 3 H 3 C CH 3 H 3 C CH 3 CH 3 H 3 C CH 3 CH 3 H 3 C H 3 C H 3 C CH 3 CH 3 CH 3 H 3 C CH 3 H 3 C CH 3 H 3 C H 3 C CH 3 CH 3 CH 3 CH 3 H 3 C CH 3 H 3 C CH 3 Mechanism of Free Radical Halogenation using Bromine Br 2 light 2 Br C h a i n I n i t i a t i o n C h a i n P r o p a g a t i o n Br C C C H H H H H H H H HBr C C C H H H H H H H Br 2 C C C H H H H H H H C C C H H H H H H H Br Br C h a i n T e r m i n a t i o n Br Br Br C C C H H H H H H H C C C H H H H H H H C C C H H H H H H H Br 2 C C C H H H H H H H Br C C C H H H H H H C C C H H H H H H H H + + Relative Reactivity 1 2 3 Chlorination 1 3.5 5 Bromination 1 97 1) Please draw the rotational energy diagram for the rotation of 2,3-dimethyl butane around the C2-C3 bond. Draw the molecule below, convert it to a Newman projection and then rotate it about the C2-C3 bond. Based on your rotations, draw the energy diagram above. 2) Please draw the rotational energy diagram for the rotation of 3-methyl pentane around the C2-C3 bond. Draw the molecule below, convert it to a Newman projection and then rotate it about the C2-C3 bond. Based on your rotations, draw the energy diagram above. 60 120 180 240 300 360 E n e rg y 60 120 180 240 300 360 E n e rg y N O C C C Cl H Cl 1 2 3 4 5 6 7 8 3) Please draw all of the isomers of C 4 H 7 Cl. There are more than a dozen. 4) Please draw all of the isomers of C 3 H 5 Cl. 5) Please draw all of the isomers of C 3 H 4 Cl 2 . 6) Please draw all of the isomers of C 3 H 8 O 7) Please answer the following questions concerning the molecule given below. a) How many pi and sigma bonds are in this compound? b) What is the hybridization on the following atoms; 1 5 7 8 9 8) Please answer the following questions concerning the molecule given below. a) How many pi and sigma bonds are in this compound? b) What is the hybridization on the following atoms; 2 3 4 5 7 8 9) Please answer the following questions concerning the molecule given below....
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This note was uploaded on 02/07/2012 for the course CHEM 1 taught by Professor Gelfand during the Spring '11 term at Solano Community College.

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Exam 1 Practice Problems and Keys - Chem 240 Practice...

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