(a) Mechanism (circle one): SN2 or SN1 CH3 (b) Mechanism (circle one): SN2 or SN1 CH3 CH3 (c) Mechanism (circle one): E2 or E1 CH3 NaOH CH3 H₂O CH3 (d) Mechanism (circle one): E2 or E1 NaOH H₂O

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For each section, circle the mechanism from the two options given and draw the main organic product resulting from that mechanism. Indicate the stereochemistry and if two configurational isomers form, draw both. 

### Reaction Mechanisms with Substitution and Elimination

**(a) Mechanism (circle one): SN2 or SN1**

- **Reaction:** The substrate is a benzyl iodide derivative with a methyl group attached to the benzene ring. It reacts with NaOH.
- **Process:** Determine if the reaction proceeds via an SN2 (bimolecular nucleophilic substitution) or SN1 (unimolecular nucleophilic substitution) mechanism.

**(b) Mechanism (circle one): SN2 or SN1**

- **Reaction:** The same benzyl iodide substrate with a methyl group undergoes reaction with water (H₂O).
- **Process:** Decide if this reaction follows an SN2 or SN1 pathway.

**(c) Mechanism (circle one): E2 or E1**

- **Reaction:** The substrate is a secondary alkyl iodide with an additional methyl group next to the iodine. It reacts with NaOH.
- **Process:** Determine if the reaction occurs via an E2 (bimolecular elimination) or E1 (unimolecular elimination) mechanism.

**(d) Mechanism (circle one): E2 or E1**

- **Reaction:** The same secondary alkyl iodide with an additional methyl group reacts with water (H₂O).
- **Process:** Identify if the elimination follows an E2 or E1 mechanism.

### Explanation:
- **SN2:** Typically involves a one-step mechanism with the nucleophile attacking from the opposite side, leading to inversion of configuration.
- **SN1:** Involves a two-step mechanism starting with the formation of a carbocation, followed by nucleophilic attack.
- **E2:** A bimolecular reaction where a base removes a proton, leading to the formation of a double bond in one concerted step.
- **E1:** A two-step mechanism where the leaving group departs first to form a carbocation, followed by deprotonation leading to the formation of a double bond.

Understanding these mechanisms aids in predicting the products and conditions favorable for each pathway.
Transcribed Image Text:### Reaction Mechanisms with Substitution and Elimination **(a) Mechanism (circle one): SN2 or SN1** - **Reaction:** The substrate is a benzyl iodide derivative with a methyl group attached to the benzene ring. It reacts with NaOH. - **Process:** Determine if the reaction proceeds via an SN2 (bimolecular nucleophilic substitution) or SN1 (unimolecular nucleophilic substitution) mechanism. **(b) Mechanism (circle one): SN2 or SN1** - **Reaction:** The same benzyl iodide substrate with a methyl group undergoes reaction with water (H₂O). - **Process:** Decide if this reaction follows an SN2 or SN1 pathway. **(c) Mechanism (circle one): E2 or E1** - **Reaction:** The substrate is a secondary alkyl iodide with an additional methyl group next to the iodine. It reacts with NaOH. - **Process:** Determine if the reaction occurs via an E2 (bimolecular elimination) or E1 (unimolecular elimination) mechanism. **(d) Mechanism (circle one): E2 or E1** - **Reaction:** The same secondary alkyl iodide with an additional methyl group reacts with water (H₂O). - **Process:** Identify if the elimination follows an E2 or E1 mechanism. ### Explanation: - **SN2:** Typically involves a one-step mechanism with the nucleophile attacking from the opposite side, leading to inversion of configuration. - **SN1:** Involves a two-step mechanism starting with the formation of a carbocation, followed by nucleophilic attack. - **E2:** A bimolecular reaction where a base removes a proton, leading to the formation of a double bond in one concerted step. - **E1:** A two-step mechanism where the leaving group departs first to form a carbocation, followed by deprotonation leading to the formation of a double bond. Understanding these mechanisms aids in predicting the products and conditions favorable for each pathway.
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