Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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
In the diagram, we observe the following elementary reaction:
1. **Reactants:**
- The left side features a molecule with a double bond and an adjacent hydrogen (H) and iodine (I) atoms.
- A negatively charged nitrogen species, denoted as anion \(\ce{N-CH3}\) with lone pairs on nitrogen, is also shown.
2. **Mechanism:**
- An arrow from the iodine (I) atom to the nitrogen anion (\(\ce{N-CH3}\)) signifies the iodine atom leaving the molecule as iodide (\(\ce{I-}\)) and the formation of a double bond in the carbon chain.
- Simultaneously, a curved arrow from the carbon-hydrogen bond near the double bond to between carbons adjacent to the double bond indicates hydrogen is being removed, resulting in the formation of \(\ce{H2C=CH}\) alkyne in the final product.
3. **Products:**
- The right side shows the final products after the mechanism: an alkyne and the anion \(\ce{N-CH3}\) now bonded to a hydrogen atom ($\ce{NH-CH3}$).
### Multiple Choice:
A) Bimolecular Elimination
B) Nucleophilic Elimination
C) Bimolecular Nucleophilic Substitution
D) Electrophilic Addition
The correct answer here is **A) Bimolecular Elimination**, because the reaction involves the elimination of atoms (hydrogen and iodine) from the substrate to form a double (alkyne) bond, and the rate of reaction depends on the concentration of both the substrate and the base, indicating a bimolecular process.
For more detailed explanations and study resources, visit our detailed section on reaction mechanisms.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F468a1036-9eac-47e7-b3af-5f844e8c7d46%2F5478095a-5e4d-4a54-8320-ad89b9b76f74%2Fn5xtgfg_processed.jpeg&w=3840&q=75)
Transcribed Image Text:### Classify the type of elementary step shown below.

In the diagram, we observe the following elementary reaction:
1. **Reactants:**
- The left side features a molecule with a double bond and an adjacent hydrogen (H) and iodine (I) atoms.
- A negatively charged nitrogen species, denoted as anion \(\ce{N-CH3}\) with lone pairs on nitrogen, is also shown.
2. **Mechanism:**
- An arrow from the iodine (I) atom to the nitrogen anion (\(\ce{N-CH3}\)) signifies the iodine atom leaving the molecule as iodide (\(\ce{I-}\)) and the formation of a double bond in the carbon chain.
- Simultaneously, a curved arrow from the carbon-hydrogen bond near the double bond to between carbons adjacent to the double bond indicates hydrogen is being removed, resulting in the formation of \(\ce{H2C=CH}\) alkyne in the final product.
3. **Products:**
- The right side shows the final products after the mechanism: an alkyne and the anion \(\ce{N-CH3}\) now bonded to a hydrogen atom ($\ce{NH-CH3}$).
### Multiple Choice:
A) Bimolecular Elimination
B) Nucleophilic Elimination
C) Bimolecular Nucleophilic Substitution
D) Electrophilic Addition
The correct answer here is **A) Bimolecular Elimination**, because the reaction involves the elimination of atoms (hydrogen and iodine) from the substrate to form a double (alkyne) bond, and the rate of reaction depends on the concentration of both the substrate and the base, indicating a bimolecular process.
For more detailed explanations and study resources, visit our detailed section on reaction mechanisms.

Transcribed Image Text:This diagram depicts a reaction mechanism commonly studied in organic chemistry. Here, the reaction involves the transformation of an alkyl group in the presence of a nucleophilic base. Let's break down the components of this diagram:
1. **Reaction Mechanism**:
- The left side of the diagram shows the starting materials: an alkyl substrate and a base (likely an amine, given the structure).
- Curved arrows indicate the flow of electrons during the reaction:
- One arrow shows the base abstracting a proton (H) from the alkyl substrate.
- Another arrow indicates the formation of a double bond as a result of this proton abstraction.
- The right side of the diagram shows the final products: an alkene and the conjugate acid of the base.
2. **Options for Reaction Type**:
- **A) bimolecular elimination**: This refers to an E2 (bimolecular elimination) mechanism where the removal of a proton and the formation of the double bond occur simultaneously.
- **B) nucleophilic elimination**: A pathway involving a nucleophile eliminating a group, typically less common and not fitting the given mechanism well.
- **C) bimolecular nucleophilic substitution**: This relates to an SN2 (substitution nucleophilic bimolecular) reaction, which does not fit the given elimination pathway.
- **D) electrophilic addition**: This describes addition reactions where an electrophile adds to a compound, not applicable here.
- **E) electrophilic elimination**: Involves the elimination of an electrophile, not fitting the present base-induced elimination mechanism.
The correct answer to the question regarding the type of reaction depicted in this diagram is option **A) bimolecular elimination**, as it showcases a base-induced simultaneous removal of a proton and formation of a double bond, characteristic of an E2 reaction mechanism.
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