16 Indicate whether each pair of Fischer projections represents enantiomers or identical structures. a. Br H CH2OH b. H ta CH3 H+₁ CH₂ Cl and Cl H and H CH2OH + CH3 - Br 0 H+H Н Η CH₂

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### Exercise 13.16

**Objective:**
Determine whether each pair of Fischer projections represents enantiomers or identical structures.

#### a. Compounds:

1. **Structure 1:**
   - Vertical: CH₂OH
   - Horizontal: Br and Cl
   - Bottom: CH₃
   
2. **Structure 2:**
   - Vertical: CH₂OH
   - Horizontal: Cl and Br
   - Bottom: CH₃

#### b. Compounds:

1. **Structure 1:**
   - Vertical: HCO
   - Horizontal: H and CH₃
   - Bottom: H
   
2. **Structure 2:**
   - Vertical: HCO
   - Horizontal: H and CH₃
   - Bottom: H

**Analysis:**

1. **Part a:**
   - The two Fischer projections are mirror images of each other across the horizontal plane (Br and Cl are swapped).
   - Since they are non-superimposable mirror images, these are enantiomers.

2. **Part b:**
   - The Fischer projections are identical. Both structures have the same orientation and connectivity of atoms.
   - Thus, they represent identical structures.
Transcribed Image Text:### Exercise 13.16 **Objective:** Determine whether each pair of Fischer projections represents enantiomers or identical structures. #### a. Compounds: 1. **Structure 1:** - Vertical: CH₂OH - Horizontal: Br and Cl - Bottom: CH₃ 2. **Structure 2:** - Vertical: CH₂OH - Horizontal: Cl and Br - Bottom: CH₃ #### b. Compounds: 1. **Structure 1:** - Vertical: HCO - Horizontal: H and CH₃ - Bottom: H 2. **Structure 2:** - Vertical: HCO - Horizontal: H and CH₃ - Bottom: H **Analysis:** 1. **Part a:** - The two Fischer projections are mirror images of each other across the horizontal plane (Br and Cl are swapped). - Since they are non-superimposable mirror images, these are enantiomers. 2. **Part b:** - The Fischer projections are identical. Both structures have the same orientation and connectivity of atoms. - Thus, they represent identical structures.
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