2. Circle the molecule that would undergo the fastest E2 reaction. Provide an explanation, using pictures and/or words, for your decision. In your analysis, consider both chair conformations of each molecule. Br Br Br Br A B C D

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**Problem Statement:**

Circle the molecule that would undergo the fastest E2 reaction. Provide an explanation, using pictures and/or words, for your decision. In your analysis, consider both chair conformations of each molecule.

**Molecular Structures:**

1. **Molecule A:**

   A hexagonal ring with two substituents:
   - On the left side (2 o'clock position): a methyl group (CH₃).
   - On the right side (10 o'clock position): a bromine atom (Br).

2. **Molecule B:**

   A hexagonal ring with two substituents:
   - On the left side (2 o'clock position): a methyl group (CH₃).
   - On the right side (10 o'clock position): a bromine atom (Br), positioned differently in space indicating stereochemistry.

3. **Molecule C:**

   A hexagonal ring with two substituents:
   - On the left side (2 o'clock position): a methyl group (CH₃), positioned differently in space indicating stereochemistry.
   - On the right side (10 o'clock position): a bromine atom (Br).

4. **Molecule D:**

   A hexagonal ring with two substituents:
   - On the left side (2 o'clock position): a methyl group (CH₃), positioned differently in space indicating stereochemistry.
   - On the right side (10 o'clock position): a bromine atom (Br), positioned differently in space indicating stereochemistry.

**Task Explanation:**

To determine which molecule would undergo the fastest E2 reaction, analyze the stability and conformation of each molecule particularly focusing on the arrangement that favors the E2 mechanism. 

Considerations should include:
- The antiperiplanar arrangement (staggered conformation) of the leaving group (Br) and the hydrogen atom that are relevant for the E2 reaction.
- The most stable conformation of the cyclohexane ring (chair form) which places the substituents in an ideal antiperiplanar position.

Comparing the chair conformations of each of these molecules will help in identifying the one that is most favorable for the E2 reaction based on these criteria.
Transcribed Image Text:**Problem Statement:** Circle the molecule that would undergo the fastest E2 reaction. Provide an explanation, using pictures and/or words, for your decision. In your analysis, consider both chair conformations of each molecule. **Molecular Structures:** 1. **Molecule A:** A hexagonal ring with two substituents: - On the left side (2 o'clock position): a methyl group (CH₃). - On the right side (10 o'clock position): a bromine atom (Br). 2. **Molecule B:** A hexagonal ring with two substituents: - On the left side (2 o'clock position): a methyl group (CH₃). - On the right side (10 o'clock position): a bromine atom (Br), positioned differently in space indicating stereochemistry. 3. **Molecule C:** A hexagonal ring with two substituents: - On the left side (2 o'clock position): a methyl group (CH₃), positioned differently in space indicating stereochemistry. - On the right side (10 o'clock position): a bromine atom (Br). 4. **Molecule D:** A hexagonal ring with two substituents: - On the left side (2 o'clock position): a methyl group (CH₃), positioned differently in space indicating stereochemistry. - On the right side (10 o'clock position): a bromine atom (Br), positioned differently in space indicating stereochemistry. **Task Explanation:** To determine which molecule would undergo the fastest E2 reaction, analyze the stability and conformation of each molecule particularly focusing on the arrangement that favors the E2 mechanism. Considerations should include: - The antiperiplanar arrangement (staggered conformation) of the leaving group (Br) and the hydrogen atom that are relevant for the E2 reaction. - The most stable conformation of the cyclohexane ring (chair form) which places the substituents in an ideal antiperiplanar position. Comparing the chair conformations of each of these molecules will help in identifying the one that is most favorable for the E2 reaction based on these criteria.
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