Exam02answersvr306

Exam02answersvr306 - Cheung Anthony – Exam 2 – Due 1:00...

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Unformatted text preview: Cheung, Anthony – Exam 2 – Due: Oct 18 2006, 1:00 pm – Inst: McCord 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points What hybridization would you expect for the carbon atoms in the cyclic compound benzene (C 6 H 6 )? 1. sp 3 2. sp 3 d 3. sp 3 d 2 4. sp 5. sp 2 correct Explanation: In each carbon one s orbital and two p or- bitals hybridize to produce three sp 2 orbitals which form sigma bonds between the carbons and between carbon and hydrogen. The re- maining p orbitals form pi bonds between the carbons. 002 (part 1 of 1) 10 points Which of the species NO, BrO, CH + 3 , BF- 4 are radicals? 1. BrO and BF + 4 only 2. NO and CH + 3 only 3. BrO, CH + 3 and BF- 4 only 4. BrO and CH + 3 only 5. NO and BF- 4 only 6. NO, CH + 3 and BF- 4 only 7. NO and BrO only correct Explanation: The Lewis Structures are N O Br O B F F F F - H C H H + Radicals are species with an unpaired elec- tron, so only NO and BrO are radicals. 003 (part 1 of 2) 10 points An organic molecule has a section in it con- sisting of alternating double and single carbon bonds. This extends over 12 carbons. The molecular orbital calculations yield 12 π or- bitals for this section (some bonding some an- tibonding). One of these orbitals is labeled 3 π and is degenerate with two other π orbitals. What is the maximum number of electrons that can be fit into this one particular π or- bital? 1. 1 2. 3 3. 6 4. 2 correct 5. 4 6. 12 Explanation: All orbitals, no matter what type, can only hold 2 electrons. 004 (part 2 of 2) 10 points What would be the number of antibonding orbitals ( π ? ) in this system? 1. 4 2. 3 3. 2 4. 1 Cheung, Anthony – Exam 2 – Due: Oct 18 2006, 1:00 pm – Inst: McCord 2 5. 12 6. 6 correct Explanation: You will get one antibonding for every bonding orbital. This means that the 12 total will be 6 bonding and 6 antibonding orbitals.will be 6 bonding and 6 antibonding orbitals....
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This note was uploaded on 11/11/2010 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas.

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Exam02answersvr306 - Cheung Anthony – Exam 2 – Due 1:00...

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