Which of the following is properly classified as a meso compound? CH3 H OH CH3 он Он H OH H H H OH H HO H HOH HFOH H CH3 A D A C.

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**Title: Identifying Meso Compounds**

**Question:**
Which of the following is properly classified as a *meso* compound?

**Choices:**

- **Option A:**
  - Structure: Two carbon atoms, each bonded to a methyl group (CH₃), a hydroxyl group (OH), and a hydrogen atom (H).
  - Diagram: Stereo center symmetry is suggested.

- **Option B:**
  - Structure: Two carbon atoms, each bonded to a hydrogen atom and two hydroxyl groups.
  - Diagram: No symmetry due to the positioning of hydroxyl groups.

- **Option C:**
  - Structure: Two carbon atoms, each bonded to an ethyl group (C₂H₅), a hydroxyl group (OH), and a hydrogen atom.
  - Diagram: Shows symmetry across central carbon atoms.

- **Option D:**
  - Structure: Two carbon atoms, one bonded to an ethyl group (C₂H₅) and the other bonded to a methyl group (CH₃), each with a hydroxyl group (OH).
  - Diagram: Asymmetric arrangement.

**Answer Choices:**

- ○ A
- ○ B
- ○ C
- ○ D

**Explanation:**
When identifying meso compounds, look for criteria that include internal plane symmetry. The compound must have multiple stereocenters and an internal mirror plane, effectively making it optically inactive despite having chiral centers.

In this question, Option C shows the necessary internal symmetry to be classified as a meso compound.
Transcribed Image Text:**Title: Identifying Meso Compounds** **Question:** Which of the following is properly classified as a *meso* compound? **Choices:** - **Option A:** - Structure: Two carbon atoms, each bonded to a methyl group (CH₃), a hydroxyl group (OH), and a hydrogen atom (H). - Diagram: Stereo center symmetry is suggested. - **Option B:** - Structure: Two carbon atoms, each bonded to a hydrogen atom and two hydroxyl groups. - Diagram: No symmetry due to the positioning of hydroxyl groups. - **Option C:** - Structure: Two carbon atoms, each bonded to an ethyl group (C₂H₅), a hydroxyl group (OH), and a hydrogen atom. - Diagram: Shows symmetry across central carbon atoms. - **Option D:** - Structure: Two carbon atoms, one bonded to an ethyl group (C₂H₅) and the other bonded to a methyl group (CH₃), each with a hydroxyl group (OH). - Diagram: Asymmetric arrangement. **Answer Choices:** - ○ A - ○ B - ○ C - ○ D **Explanation:** When identifying meso compounds, look for criteria that include internal plane symmetry. The compound must have multiple stereocenters and an internal mirror plane, effectively making it optically inactive despite having chiral centers. In this question, Option C shows the necessary internal symmetry to be classified as a meso compound.
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