Which of the following is/meso compounds? ОН ОН OH I ОН ОН OH OH || ОН ОН ОН ОН Ш

Chemistry
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Chapter22: Organic And Biological Molecules
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Which of the following is/ meso compounds?

A) I

B) II

C) III

D) I and II

**Question:**

Which of the following is/are meso compounds?

**Explanation:**

In the provided image, there are three chemical structures labeled I, II, and III. Each structure contains several hydroxyl groups (OH) positioned on a carbon chain. The objective is to determine which of these structures is/are meso compounds.

**Structure I:**
- This structure shows a carbon chain with three hydroxyl groups (OH) each bonded to separate carbon atoms.
- There is symmetry present in this molecule due to the two hydroxyl groups (OH) at equivalent positions on the first and third carbon atoms, while the hydroxyl group in the middle makes the molecule potentially meso.

**Structure II:**
- This structure represents a carbon chain with four hydroxyl groups (OH) bonded to different carbon atoms.
- The hydroxyl groups on the second and third carbon atoms, each on a wedge and a dash, suggest these are stereocenters.

**Structure III:**
- This structure depicts a carbon chain with five hydroxyl groups (OH) bonded to different carbon atoms.
- Similar to Structure II, the presence of hydroxyl groups on stereocenters, indicated by wedges and dashes, is observed.

**Detailed Analysis:**
- **Meso compounds** are molecules that have multiple stereocenters but are superimposable on their mirror images due to an internal plane of symmetry.

Upon analyzing all three structures:
- **Structure I** has a plane of symmetry dividing the molecule into two equal halves, each reflecting the other half. Hence, Structure I is a meso compound.
- **Structure II** lacks such a plane of symmetry and cannot be superimposed on its mirror image despite having stereocenters. Therefore, Structure II is not a meso compound.
- **Structure III** also does not exhibit a plane of symmetry and therefore cannot be superimposed on its mirror image, making Structure III not a meso compound.

**Conclusion:**
- The correct answer is **Structure I** as the meso compound.
Transcribed Image Text:**Question:** Which of the following is/are meso compounds? **Explanation:** In the provided image, there are three chemical structures labeled I, II, and III. Each structure contains several hydroxyl groups (OH) positioned on a carbon chain. The objective is to determine which of these structures is/are meso compounds. **Structure I:** - This structure shows a carbon chain with three hydroxyl groups (OH) each bonded to separate carbon atoms. - There is symmetry present in this molecule due to the two hydroxyl groups (OH) at equivalent positions on the first and third carbon atoms, while the hydroxyl group in the middle makes the molecule potentially meso. **Structure II:** - This structure represents a carbon chain with four hydroxyl groups (OH) bonded to different carbon atoms. - The hydroxyl groups on the second and third carbon atoms, each on a wedge and a dash, suggest these are stereocenters. **Structure III:** - This structure depicts a carbon chain with five hydroxyl groups (OH) bonded to different carbon atoms. - Similar to Structure II, the presence of hydroxyl groups on stereocenters, indicated by wedges and dashes, is observed. **Detailed Analysis:** - **Meso compounds** are molecules that have multiple stereocenters but are superimposable on their mirror images due to an internal plane of symmetry. Upon analyzing all three structures: - **Structure I** has a plane of symmetry dividing the molecule into two equal halves, each reflecting the other half. Hence, Structure I is a meso compound. - **Structure II** lacks such a plane of symmetry and cannot be superimposed on its mirror image despite having stereocenters. Therefore, Structure II is not a meso compound. - **Structure III** also does not exhibit a plane of symmetry and therefore cannot be superimposed on its mirror image, making Structure III not a meso compound. **Conclusion:** - The correct answer is **Structure I** as the meso compound.
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