### CHEM 2251: Problem Set 4#### Problem 4**Task:** Draw the structure of 1,1-dibromo-2-methylpropane.1. **Looking down the C1–C2 bond**, draw a Newman projection. Then, by rotating that bond 60 degrees at a time, **draw the 5 remaining Newman projections**.2. **Label each Newman projection** as staggered or eclipsed.3. Label any/all **steric strain**.4. **Draw an energy diagram** ranking the relative energy of each Newman projection as you move through the full 360-degree rotation.---**Newman Projections of 1,1-dibromo-2-methylpropane**1. **Structure:** - The given formula outlines the positions of Br, H, and CH3 groups as: ``` Br CH3 | | Br-C1 C3 | | H-C2-H H-C3-H ```2. **Newman Projections:** i. **Projection 1: Staggered** - Front carbon (C1): Br, H, H - Rear carbon (C2): CH3, Br, H ``` H Br CH3 / | \ Br — C1 — C2 — CH3 \ | / H H Br (Drawing: Front carbon in the circle, rear groups staggered) ``` ii. **Projection 2: Eclipsed (60° rotation)** - Front carbon (C1): Br, H, H - Rear carbon (C2): CH3, H, Br ``` Br Br H / | \ H — C1 — C2 — H \ | / H CH3 CH3 (Drawing: Front carbon in the circle, rear groups eclipsed) ``` iii. **Projection 3: Staggered (60° further rotation)** - Front carbon (C1): Br, H, H - Rear carbon (C2): Br, CH3, H ``` H CH3 Br / | \ Br — C1 — C

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Help eclipsed. C. Label any/all steric strain. D. Draw an energy diagram ranking the relative energy of each Newman projection as you move through the full 360 rotation. 11

Chemistry

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ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

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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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### CHEM 2251: Problem Set 4

#### Problem 4

**Task:** Draw the structure of 1,1-dibromo-2-methylpropane.

1. **Looking down the C1–C2 bond**, draw a Newman projection. Then, by rotating that bond 60 degrees at a time, **draw the 5 remaining Newman projections**.
2. **Label each Newman projection** as staggered or eclipsed.
3. Label any/all **steric strain**.
4. **Draw an energy diagram** ranking the relative energy of each Newman projection as you move through the full 360-degree rotation.

---

**Newman Projections of 1,1-dibromo-2-methylpropane**

1. **Structure:**
- The given formula outlines the positions of Br, H, and CH3 groups as:
```
Br CH3
| |
Br-C1 C3
| |
H-C2-H H-C3-H
```

2. **Newman Projections:**

i. **Projection 1: Staggered**
- Front carbon (C1): Br, H, H
- Rear carbon (C2): CH3, Br, H
```
H Br CH3
/ | \
Br — C1 — C2 — CH3
\ | /
H H Br
(Drawing: Front carbon in the circle, rear groups staggered)
```

ii. **Projection 2: Eclipsed (60° rotation)**
- Front carbon (C1): Br, H, H
- Rear carbon (C2): CH3, H, Br
```
Br Br H
/ | \
H — C1 — C2 — H
\ | /
H CH3 CH3
(Drawing: Front carbon in the circle, rear groups eclipsed)
```

iii. **Projection 3: Staggered (60° further rotation)**
- Front carbon (C1): Br, H, H
- Rear carbon (C2): Br, CH3, H
```
H CH3 Br
/ | \
Br — C1 — C

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15.
In kcal/mol