The ACS Exams Organic Chemistry Practice Items provide a comprehensive set of questions designed for students preparing for organic chemistry assessments. This handout includes practice questions covering key topics such as hybridization, isomers, acidity, nucleophilic substitution reactions, and more. Ideal for college-level organic chemistry courses, it serves as a valuable resource for exam preparation and self-assessment. Each question is structured to enhance understanding and application of organic chemistry concepts, making it suitable for both classroom and independent study.

Key Points

  • Includes practice questions on hybridization and molecular structure
  • Covers isomer identification and nomenclature in organic chemistry
  • Features questions on acidity and basicity of organic compounds
  • Provides insights into nucleophilic substitution and elimination reactions
Kayla Tomasik
15 pages
Language:English
Type:Study Guide
Exams
Kayla Tomasik
15 pages
Language:English
Type:Study Guide
Exams
57
/ 15
American Chemical Society
Division of Chemical Education
Examinations Institute
Organic Chemistry, Full-Year Practice Items
Study Question – Chapter 1 (Structure: Shape and Stability)
1A.
What hybrid orbitals are used to form the sigma bond between the indicated carbon atoms
(indicated with stars)?
*
*
(A)
sp and sp
(B)
sp
3
and sp
(C)
sp
2
and sp
(D)
sp
2
and sp
3
Work:
Practice Question – Chapter 1 (Structure: Shape and Stability)
1B.
Which of the following structures contributes more to the hybrid structure for this
molecule?
O
N
H
(A)
O
N
H
(B)
O
N
H
(C)
O
N
H
(D)
O
N
H
Work:
References below are to the ACS Exams Organic Chemistry Study Guide
For more practice, please see: Study Questions: SQ 6 and 10 (p. 20 - 23)
Practice Questions: PQ 11-16, 25-26 (p. 25-29)
2
Study Question – Chapter 3 (Structure: Isomers)
2A.
What is the IUPAC name of this molecule?
(A)
(2S, 4S) 2-chloro-5-ethylheptan-4-ol
(B)
(2S, 4R) 2-chloro-5-ethylheptan-4-ol
(C)
(2R, 4S) 2-chloro-5-ethylheptan-4-ol
(D)
(2R, 4R) 2-chloro-5-ethylheptan-4-ol
Work:
Practice Question – Chapter 3 (Structure: Isomers)
2B.
Which best describes the most stable conformation of cis-1-chloro-4-isopropylcyclohexane?
(A)
The isopropyl group is equatorial, and the chloro group is axial.
(B)
The isoprpyl group is axial, and the chloro group is equatorial.
(C)
Both the chloro and isopropyl group are equatorial.
(D)
Both the chloro and isopropyl group are axial.
Work:
For more practice, please see: Study Questions: SQ1, 4 (p. 41-45)
Practice Questions: PQ1-5, 11-14 (p. 48-50)
3
Study Question – Chapter 4 (Acids and Bases)
3A.
Rank the following compounds in order of increasing acidity.
OH
OH
O
OH
OH
O
O
2
N
O
2
N
I II III IV
(A)
II < IV < I < III
(B)
II < IV < III < I
(C)
IV < III < II < I
(D)
IV < II < I < III
Work:
Practice Question – Chapter 4 (Acids and Bases)
3B.
What is the most basic nitrogen lone pair in the molecule below?
(A)
I
(B)
II
(C)
III
(D)
IV
Work:
For more practice, please see: Study Questions: SQ 7-8 (p.59-60)
Practice Questions: PQ 22-27 (p.63-64)
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End of Document
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FAQs

What are the hybrid orbitals used to form sigma bonds in organic chemistry?
In organic chemistry, the hybrid orbitals used to form sigma bonds depend on the types of carbon atoms involved. For instance, the options include sp, sp2, and sp3 hybridization. Specifically, the hybridization can vary based on the molecular structure, such as sp and sp for triple bonds, or sp3 and sp for single bonds. Understanding these hybridizations is crucial for predicting molecular geometry and reactivity.

What is the IUPAC name for a specific organic compound with chlorine and hydroxyl groups?
The IUPAC naming of compounds with functional groups like chlorine and hydroxyl groups involves identifying the correct stereochemistry and substituents. For example, options include names like (2S, 4S) 2-chloro-5-ethylheptan-4-ol and others, which specify the positions and configurations of the substituents on the carbon chain. Correctly naming these compounds is essential for clear communication in organic chemistry.

How do you rank compounds in order of increasing acidity?
Ranking compounds by acidity involves analyzing the stability of their conjugate bases. For example, in the document, compounds are ranked based on their functional groups and resonance effects. The correct order of increasing acidity can be determined by evaluating factors such as electronegativity and the ability to stabilize negative charge. The document provides specific compounds to compare, allowing students to practice this important concept.

What is the major product of a specific elimination reaction?
In elimination reactions, the major product is determined by the stability of the resulting alkene. For instance, when reacting a compound with sodium ethoxide in ethanol, the expected major product can be predicted based on Zaitsev's rule, which states that the more substituted alkene is favored. The document provides specific reaction conditions and substrates to illustrate this principle, helping students understand elimination mechanisms.

What is the HOMO for 1,3,5-hexatriene?
The Highest Occupied Molecular Orbital (HOMO) for 1,3,5-hexatriene is crucial for understanding its reactivity and electronic properties. The document outlines the molecular structure and the arrangement of π electrons in this conjugated system. Identifying the HOMO helps predict how the molecule will interact with electrophiles and other reagents in organic reactions.

Which substituent is an activating ortho, para-director in electrophilic aromatic substitution?
In electrophilic aromatic substitution reactions, substituents can significantly influence the reactivity and orientation of the incoming electrophile. The document identifies certain groups, such as -OCONH2, as activating ortho, para-directors, which enhance the reactivity of the aromatic ring towards electrophiles. Understanding these directing effects is essential for predicting the outcomes of substitution reactions.

What is the major product of a reaction involving carbonyl chemistry?
In carbonyl chemistry, the major product of reactions often involves nucleophilic attack and subsequent transformations. The document provides examples of reactions where carbonyl compounds react with nucleophiles, leading to specific products. Understanding the mechanisms and conditions that favor certain pathways is key to mastering organic synthesis and reactivity.