4. For each structure given below: draw a Fischer projection for all possible stereoisomers. Draw the longest carbon chain vertical. circle each stereoisomer which would be optically active. OH CH;CH2CHCHCH2CH3 ÓH (а) 인 앤 НОСНСНCHCH; CI OH (b)

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**Exercise 4: Stereochemistry and Fischer Projections**

For each structural formula given below, follow these instructions:

- **Draw a Fischer projection** for all possible stereoisomers. Ensure that the longest carbon chain is oriented vertically.
- **Circle each stereoisomer** that is optically active.

**Structure (a):**
- Molecular structure: 
  - The main carbon chain is CH₃CH₂CHCH₂CH₃.
  - Hydroxyl groups (OH) are attached to the second and third carbons of the main chain.

**Structure (b):**
- Molecular structure:
  - The core chain is HOCHCHCHCH₃.
  - Hydroxyl group (OH) is attached to the second carbon.
  - Chlorine (Cl) atoms are attached to the first and third carbons.

**Instructions for Fischer Projections:**

1. Identify the chiral centers (carbon atoms attached to four different groups).
2. Draw each stereoisomer considering the possible configurations (R/S).
3. Use vertical lines for bonds going behind the plane and horizontal lines for bonds coming out of the plane.
4. Determine which isomers are optically active (those that have no internal plane of symmetry).

This exercise involves understanding stereochemistry and visualizing molecules in three dimensions through Fischer projections.
Transcribed Image Text:**Exercise 4: Stereochemistry and Fischer Projections** For each structural formula given below, follow these instructions: - **Draw a Fischer projection** for all possible stereoisomers. Ensure that the longest carbon chain is oriented vertically. - **Circle each stereoisomer** that is optically active. **Structure (a):** - Molecular structure: - The main carbon chain is CH₃CH₂CHCH₂CH₃. - Hydroxyl groups (OH) are attached to the second and third carbons of the main chain. **Structure (b):** - Molecular structure: - The core chain is HOCHCHCHCH₃. - Hydroxyl group (OH) is attached to the second carbon. - Chlorine (Cl) atoms are attached to the first and third carbons. **Instructions for Fischer Projections:** 1. Identify the chiral centers (carbon atoms attached to four different groups). 2. Draw each stereoisomer considering the possible configurations (R/S). 3. Use vertical lines for bonds going behind the plane and horizontal lines for bonds coming out of the plane. 4. Determine which isomers are optically active (those that have no internal plane of symmetry). This exercise involves understanding stereochemistry and visualizing molecules in three dimensions through Fischer projections.
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