Identify which of the following compounds is meso.   A) I B) II C) III D) IV

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Chapter1: Chemical Foundations
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Identify which of the following compounds is meso.

 

  1. A) I
  2. B) II
  3. C) III
  4. D) IV
The image depicts four stereoisomers labeled I, II, III, and IV. Each isomer consists of a carbon backbone with specific groups attached, including methoxy groups (OCH₃), hydrogen (H), and methyl groups (CH₃). Each molecule is illustrated in a three-dimensional format showing the spatial arrangement of these groups around chiral centers.

### Structure Details:

**Isomer I**:
- The central carbon is bonded to a methoxy group (H₃CO) and a hydrogen (H), both positioned with solid wedges indicating they are pointing out of the plane towards the viewer.
- Another methoxy group (OCH₃) and a methyl group (CH₃) are attached with dashed wedges, indicating they are oriented into the plane away from the viewer.

**Isomer II**:
- Similar to Isomer I, it has a methoxy group (H₃CO) and a hydrogen (H) with solid wedges directed towards the viewer.
- It also has a methoxy group (OCH₃) and a methyl group (CH₃) with dashed wedges going into the plane.

**Isomer III**:
- This structure displays the methoxy group (H₃CO) and hydrogen (H) on solid wedges.
- The methyl (CH₃) and methoxy (OCH₃) groups are on dashed wedges.

**Isomer IV**:
- Here, the methoxy group (H₃CO) and hydrogen (H) are on solid wedges.
- The opposite side features a methyl group (CH₃) and a methoxy group (OCH₃) with dashed bonds.

### Explanation:

Each stereoisomer is drawn to reflect a unique spatial configuration. The use of solid and dashed wedges is crucial for identifying the specific three-dimensional arrangements, which determine the chemical properties and biological interactions of these molecules.
Transcribed Image Text:The image depicts four stereoisomers labeled I, II, III, and IV. Each isomer consists of a carbon backbone with specific groups attached, including methoxy groups (OCH₃), hydrogen (H), and methyl groups (CH₃). Each molecule is illustrated in a three-dimensional format showing the spatial arrangement of these groups around chiral centers. ### Structure Details: **Isomer I**: - The central carbon is bonded to a methoxy group (H₃CO) and a hydrogen (H), both positioned with solid wedges indicating they are pointing out of the plane towards the viewer. - Another methoxy group (OCH₃) and a methyl group (CH₃) are attached with dashed wedges, indicating they are oriented into the plane away from the viewer. **Isomer II**: - Similar to Isomer I, it has a methoxy group (H₃CO) and a hydrogen (H) with solid wedges directed towards the viewer. - It also has a methoxy group (OCH₃) and a methyl group (CH₃) with dashed wedges going into the plane. **Isomer III**: - This structure displays the methoxy group (H₃CO) and hydrogen (H) on solid wedges. - The methyl (CH₃) and methoxy (OCH₃) groups are on dashed wedges. **Isomer IV**: - Here, the methoxy group (H₃CO) and hydrogen (H) are on solid wedges. - The opposite side features a methyl group (CH₃) and a methoxy group (OCH₃) with dashed bonds. ### Explanation: Each stereoisomer is drawn to reflect a unique spatial configuration. The use of solid and dashed wedges is crucial for identifying the specific three-dimensional arrangements, which determine the chemical properties and biological interactions of these molecules.
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