18. Identify all chiral centers in each molecule below. Determine whether each molecule is chiral or achiral. If the achiral molecules are meso, classify them as such.

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### Identification of Chiral Centers and Classification of Molecules

**Task:**
Examine the molecular structures provided to identify all chiral centers. Determine if each molecule is chiral or achiral. If the achiral molecules are meso, classify them accordingly.

**Molecular Structures:**

1. **Structure 1:** Contains a carbon bonded to an OH (hydroxyl) group and a Cl (chlorine) atom.
2. **Structure 2:** Contains a carbon with two OH (hydroxyl) groups.
3. **Structure 3:** Contains a carbon with no additional groups shown explicitly.
4. **Structure 4:** Cyclic structure with a three-carbon ring.
5. **Structure 5:** Contains a Cl (chlorine) attached to a chain with branching.
6. **Structure 6:** A cyclic structure featuring an OH (hydroxyl) group and a Br (bromine) atom.
7. **Structure 7:** A six-membered ring structure, with no explicit substituents shown.

**Instructions:**

- **Chiral Center Identification:** Look for carbon atoms bonded to four different groups.
- **Chirality Determination:** A molecule is chiral if it has at least one chiral center and lacks a plane of symmetry.
- **Meso Classification:** If a molecule is achiral and has chiral centers arranged in a way that creates a mirror plane, it may be classified as meso.

Consider these aspects while interpreting each molecule to complete the task.
Transcribed Image Text:### Identification of Chiral Centers and Classification of Molecules **Task:** Examine the molecular structures provided to identify all chiral centers. Determine if each molecule is chiral or achiral. If the achiral molecules are meso, classify them accordingly. **Molecular Structures:** 1. **Structure 1:** Contains a carbon bonded to an OH (hydroxyl) group and a Cl (chlorine) atom. 2. **Structure 2:** Contains a carbon with two OH (hydroxyl) groups. 3. **Structure 3:** Contains a carbon with no additional groups shown explicitly. 4. **Structure 4:** Cyclic structure with a three-carbon ring. 5. **Structure 5:** Contains a Cl (chlorine) attached to a chain with branching. 6. **Structure 6:** A cyclic structure featuring an OH (hydroxyl) group and a Br (bromine) atom. 7. **Structure 7:** A six-membered ring structure, with no explicit substituents shown. **Instructions:** - **Chiral Center Identification:** Look for carbon atoms bonded to four different groups. - **Chirality Determination:** A molecule is chiral if it has at least one chiral center and lacks a plane of symmetry. - **Meso Classification:** If a molecule is achiral and has chiral centers arranged in a way that creates a mirror plane, it may be classified as meso. Consider these aspects while interpreting each molecule to complete the task.
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