Which of the following Newman projections represents 2,3-dimethylpentane? CH3 CH(CH3)2 CH(CH3)2 H | | | | H-CH3 H H H | | | | CH(CH3)2 CH3 CH3 CH(CH3)2 1 2 3 4 a. 1 b. 2 c. 3 d. 4
The Correct Answer and Explanation is:
Front Carbon: H, H, and an isopropyl group (CH(CH₃)₂).
* Back Carbon: H, H, and an isopropyl group (CH(CH₃)₂).
Reconstructing this molecule gives 2,5-dimethylhexane, which is incorrect.
- Projection 3:
- Front Carbon: H, CH₃, and CH₃.
- Back Carbon: H, H, and an isopropyl group (CH(CH₃)₂).
Reconstructing this molecule gives 2,2,4-trimethylpentane, which is incorrect.
- Projection 4:
- Front Carbon: H, H, and H.
- Back Carbon: H, an isopropyl group (CH(CH₃)₂), and another isopropyl group (CH(CH₃)₂).
Reconstructing this molecule gives 2,3,4-trimethylpentane, which is incorrect.
Therefore, only Newman projection 1 correctly represents the molecule 2,3-dimethylpentane.
