Question 9 of 25 Submit representing L-alanine and two representing D-alanine. Which pair represents D-alanine? A B *H3N-C-H *H3N- -CH3 ČH3 H D H3C- -C- -NH3* H -C-NH3* CH3 A) A and B C.

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**Question 9 of 25**

Two of the structures below are models representing L-alanine and two representing D-alanine. Which pair represents D-alanine?

**Diagrams:**

- **Structure A:**
  - Contains a central carbon (C) with four bonds:
    - A carboxylate group (\( \text{O}^-\), double-bonded to the central C atom).
    - An amino group (\(+\text{H}_3\text{N}\)).
    - A hydrogen atom (H).
    - A methyl group (\( \text{CH}_3\)).

- **Structure B:**
  - Contains a central carbon (C) with four bonds:
    - A carboxylate group (\( \text{O}^-\), double-bonded to the central C atom).
    - An amino group (\(+\text{H}_3\text{N}\)).
    - A methyl group (\( \text{CH}_3\)).
    - A hydrogen atom (H).

- **Structure C:**
  - Contains a central carbon (C) with four bonds:
    - A carboxylate group (\( \text{O}^-\), double-bonded to the central C atom).
    - A methyl group (\( \text{CH}_3\)).
    - A hydrogen atom (H).
    - An amino group (\(+\text{NH}_3^+\)).

- **Structure D:**
  - Contains a central carbon (C) with four bonds:
    - A carboxylate group (\( \text{O}^-\), double-bonded to the central C atom).
    - A hydrogen atom (H).
    - A methyl group (\( \text{CH}_3\)).
    - An amino group (\(+\text{NH}_3^+\)).

**Options:**

A) A and B  
B) C and D  
C) A and C  
D) B and D
Transcribed Image Text:**Question 9 of 25** Two of the structures below are models representing L-alanine and two representing D-alanine. Which pair represents D-alanine? **Diagrams:** - **Structure A:** - Contains a central carbon (C) with four bonds: - A carboxylate group (\( \text{O}^-\), double-bonded to the central C atom). - An amino group (\(+\text{H}_3\text{N}\)). - A hydrogen atom (H). - A methyl group (\( \text{CH}_3\)). - **Structure B:** - Contains a central carbon (C) with four bonds: - A carboxylate group (\( \text{O}^-\), double-bonded to the central C atom). - An amino group (\(+\text{H}_3\text{N}\)). - A methyl group (\( \text{CH}_3\)). - A hydrogen atom (H). - **Structure C:** - Contains a central carbon (C) with four bonds: - A carboxylate group (\( \text{O}^-\), double-bonded to the central C atom). - A methyl group (\( \text{CH}_3\)). - A hydrogen atom (H). - An amino group (\(+\text{NH}_3^+\)). - **Structure D:** - Contains a central carbon (C) with four bonds: - A carboxylate group (\( \text{O}^-\), double-bonded to the central C atom). - A hydrogen atom (H). - A methyl group (\( \text{CH}_3\)). - An amino group (\(+\text{NH}_3^+\)). **Options:** A) A and B B) C and D C) A and C D) B and D
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