3.(a) Draw Newman projections for the anti, gauche and fully eclipsed conformers of hexane as viewed through C-3 (the third carbon) You do not need to draw the graph nor all of the structures. One of each type is enough (b) Rank them in order of stability (1-most stable, 3-least stable) © What types of strain are present in each

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### Newman Projections and Stability of Hexane Conformers

**3. (a)** Draw Newman projections for the anti, gauche, and fully eclipsed conformers of hexane as viewed through C-3 (the third carbon).

You do not need to draw the graph nor all of the structures. One of each type is enough.

**(b)** Rank them in order of stability (1-most stable, 3-least stable).

**(c)** What types of strain are present in each?

---

### Explanation

In this exercise, you will explore different conformational isomers of hexane through Newman projections. A Newman projection is a way to visualize the conformation of a molecule from a specific viewpoint along a bond axis. Here, you will examine the conformers of hexane by looking along the C-3 to C-4 bond.

1. **Anti Conformer**
   - In the anti conformer, large substituents are opposite each other (180 degrees apart), minimizing steric hindrance.
   - **Stability:** Most stable due to minimal torsional strain.
   - **Strain:** Minimal or none.

2. **Gauche Conformer**
   - In the gauche conformer, large substituents are 60 degrees apart, leading to some steric interactions.
   - **Stability:** Less stable than anti due to increased steric hindrance.
   - **Strain:** Steric strain.

3. **Fully Eclipsed Conformer**
   - In the fully eclipsed conformer, large substituents directly overlap, maximizing torsional strain.
   - **Stability:** Least stable due to high torsional strain.
   - **Strain:** Torsional strain and steric strain.

Use these descriptions to understand how molecular interactions and strain influence the stability of different conformers in hexane.
Transcribed Image Text:### Newman Projections and Stability of Hexane Conformers **3. (a)** Draw Newman projections for the anti, gauche, and fully eclipsed conformers of hexane as viewed through C-3 (the third carbon). You do not need to draw the graph nor all of the structures. One of each type is enough. **(b)** Rank them in order of stability (1-most stable, 3-least stable). **(c)** What types of strain are present in each? --- ### Explanation In this exercise, you will explore different conformational isomers of hexane through Newman projections. A Newman projection is a way to visualize the conformation of a molecule from a specific viewpoint along a bond axis. Here, you will examine the conformers of hexane by looking along the C-3 to C-4 bond. 1. **Anti Conformer** - In the anti conformer, large substituents are opposite each other (180 degrees apart), minimizing steric hindrance. - **Stability:** Most stable due to minimal torsional strain. - **Strain:** Minimal or none. 2. **Gauche Conformer** - In the gauche conformer, large substituents are 60 degrees apart, leading to some steric interactions. - **Stability:** Less stable than anti due to increased steric hindrance. - **Strain:** Steric strain. 3. **Fully Eclipsed Conformer** - In the fully eclipsed conformer, large substituents directly overlap, maximizing torsional strain. - **Stability:** Least stable due to high torsional strain. - **Strain:** Torsional strain and steric strain. Use these descriptions to understand how molecular interactions and strain influence the stability of different conformers in hexane.
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