practice4B - Chem 210 Practice Exam 4B Organic Chemistry:...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chem 210 Practice Exam 4B Page 1 of 17 Organic Chemistry: Chem 210 Practice Exam 4B There are 28 questions on this exam including one spectral problem. Check that you have done all of the problems and filled in the first 28 bubbles on the scantron. The number of points per question are clearly labeled in the text. The maximum score on the exam is 100 points. Instructions Answer sheet 1) On the scantron, you need to clearly fill: y o u r name and your student number , section number Section 001, 12:20 pm lecture Section 002, 3:35 pm lecture test form (white = test form A; yellow = test form B; blue = test form C, green = test form D). 2) Use a #2 pencil Exam policy 1) No electronic devices of any kind, such as calculators, cell phones, or even more advanced digital watches, are allowed. Possession of such devices during the exam, whether in use or not, is grounds for awarding a zero on the exam. 2) Molecular models are allowed (no instruction pages are permitted, however). 3) There are some blank pages at the end of the test that can be used as scratch paper. 4) Relevant tables, including the periodic table, are attached at the end of this exam. 5) Numerical values given in one question apply only to that question, and should not be used in other questions, unless there is a specific instruction to do so. If necessary, the values from the provided tables should be used, even if they differ from values that you may remember from different sources. 6) The exam results are based strictly on scantron’s marks. No extraneous information is used to adjust the scores. Mark your choices with extra care. 7) You may not take the exam with you . You may copy your answers on the provided page and compare them with the answer key. The answer key will be posted on the web after the exam (under "News"). Hints 1) As you read the question, underline or circle key words to highlight them for yourself. 2) Questions have only one correct answer. No partial credit will be given. 3) There is no penalty for guessing.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chem 210 Practice Exam 4B Page 2 of 17 1 . (4 pts) The first transition state in the overall exergonic addition of HBr to propene resembles the intermediate (carbocation). Chose the best phrase to complete the following statement: The second transition state (for addition of Br to the carbocation) . ...... a) resembles the final product b) resembles the 2-propyl cation c) resembles propene d) has all carbons almost entirely sp 3 hybridized e) has much higher energy than the first transition state f) has both carbons of the former π system sp 2 hybridized 2 . (4 pts) The alternative reaction pathways for radical chain reactions of Br 2 with ethane may be represented as follows: CH 3 CH 3 (1) + Br 2 CH 3 CH 2 HBr 2 + CH 3 3 (2) + CH 3 2 Which statement is correct? a) reaction (1) is more likely because it is more endothermic b) reaction (2) is more likely because it is more endothermic c) reaction (1) is more likely because it is more exothermic d) reaction (2) is more likely because it is more exothermic e) reactions (1) and (2) are equally likely because they have almost identical Δ H
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/10/2008 for the course CHEM 210 taught by Professor Maslak,przemyslaw during the Spring '08 term at Pennsylvania State University, University Park.

Page1 / 17

practice4B - Chem 210 Practice Exam 4B Organic Chemistry:...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online