Organic Chemistry Exam Overview

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Questions and Answers

What is the best method to contact Dr. Biffinger?

Email (correct)

In Person

Office Hours

Phone

What is the total point value of the homework assignments?

220 (correct)

300

720

100

What is the format of the final exam?

Online, 50 minutes

In-class, 50 minutes

Cumulative, ACS Organic Chemistry Standardized Exam (correct)

Open-book, 50 minutes

If a student's final exam score is higher than their lowest semester exam score, what happens?

The final exam score will replace the lowest semester exam score. (B) Signup and view all the answers

What is the maximum percentage of extra credit points possible in the course?

5% (D) Signup and view all the answers

What is the main reason why conjugated dienes are more stable than isolated dienes?

The presence of a delocalized pi electron system. (D) Signup and view all the answers

How are conjugated dienes typically synthesized?

Elimination of HX from an allylic halide. (B) Signup and view all the answers

According to the valence bond theory, what contributes to the stability of conjugated dienes?

The presence of a shorter central single bond. (C) Signup and view all the answers

What is the main reason why conjugated dienes have a shorter central single bond?

Due to the overlap of the p orbitals. (B) Signup and view all the answers

How does the molecular orbital theory explain the stability of conjugated dienes?

The delocalized pi electrons in the conjugated system create a lower energy state. (B) Signup and view all the answers

Which of the following is NOT a feature of conjugated dienes?

They have higher heats of hydrogenation compared to isolated dienes. (D) Signup and view all the answers

How many π Molecular orbitals are present in a 1,3-Butadiene molecule?

4 (D) Signup and view all the answers

Which of the following statements is TRUE about the products of electrophilic addition reactions of conjugated dienes?

The products are always a mixture of both 1,2 and 1,4 addition products. (B), 1,4-addition products are formed due to the intermediate action of allylic carbocations. (C) Signup and view all the answers

What would be the major thermodynamic product from the reaction of HBr with 1,3-butadiene?

3-bromobut-1-ene (C) Signup and view all the answers

In the addition of HBr to a conjugated diene, which product would be formed more quickly?

The 1,2-addition adduct (C) Signup and view all the answers

What is the best explanation for why the major product of the reaction of HBr with 1,3-butadiene at low temperatures is the 1,2-addition product?

The 1,2-addition product is formed more quickly than the 1,4-addition product. (A) Signup and view all the answers

Why does the reaction of HBr with 1,3-butadiene at higher temperatures lead to a higher proportion of the 1,4-addition product?

The 1,4-addition product is more stable than the 1,2-addition product. (B) Signup and view all the answers

Study Notes

Instructor and Contact Information

Instructor: Dr. Biffinger
Office: SC 295B
Phone: 9-2849
Email: [email protected]
Office Hours: Tuesdays 2:00pm - 3:30pm or by appointment via email

Grading

Course grade composed of homework, exams, and a cumulative Org1/2 Final Exam
Total points: 720
Grading scheme changes will be justified and communicated to the class
Exams: 3 exams, 50 minutes each, worth 100 points each (300 points total, 41%)
Homework: Weekly assignments via OWLv2.0, due Sundays at 11:59pm (or as altered in class) (220 points, 31%)
Final Exam: Cumulative American Chemical Society (ACS) Organic Chemistry Standardized Exam (200 points, 28%)
Final Exam grade replaces lowest semester exam score if higher, automatically
Extra Credit: Periodic extra credit questions (maximum 5% or 36 points)

Schedule (approximate)

Week 1: Chapter 14 (Conjugated Compounds and UV Spectroscopy)
Week 2: Chapter 15 (Benzene and Aromaticity)
Week 3: Chapter 16 (Chemistry of Benzene), Exam 1 (100 points)
Week 4: Chapter 17 (Alcohols and Phenols)
Week 5: Chapter 18 (Ethers and Epoxides; Thiols and sulfides)
Week 6: Chapter 19 (Aldehydes and Ketones), Exam 2 (100 points)
Week 7: Chapter 20 (Carboxylic Acids and Nitriles)
Week 8: Chapter 21 (Carboxylic Acid Derivatives)
Week 9: Chapter 22 (Carbonyl Alpha-Substitution Reactions)
Week 10: Chapter 23 (Carbonyl Condensation Reactions), Exam 3 (100 points)
Remainder of class time: Chapter 24 (Amines and Heterocycles)
Final Exam: ACS Full Year Standardized Exam (200 Points), 10:10-12:00 pm on 5/5/25

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Description

This quiz covers important information related to the grading, exam structure, and schedule for the Organic Chemistry course. Focus is on Chapters 14 and 15, which deal with conjugated compounds, UV spectroscopy, benzene, and aromaticity. Understand the weight of homework, exams, and the final assessment to effectively prepare.