Which among the following compound has [L] configuration

Options

A. `H-underset(CH_2OH)underset(|)overset(CHO)overset(|)C-OH`
B. `H-underset(CH_2OH)underset(|)overset(COOH)overset(|)C-NH_2`
C. `{:(" "COOH),(" |"),(" "H-C-OH),(" |"),(" "H-C-OH),(" |"),(" "HO-C-H),(" |"),(" "CH_(2)OH):}`
D. `{:(" "CHO),(" |"),(" "HO-C-H),(" |"),(" "H-C-OH),(" |"),(" "CH_(2)OH):}`

Answer

To determine which compound has an L-configuration, we need to follow a systematic approach to analyze the configurations of the given compounds. Here’s a step-by-step solution:

### Step 1: Understanding L and D Configurations
- The L (levo) and D (dextro) configurations are used to describe the orientation of the hydroxyl (-OH) or amino (-NH2) groups in sugars and amines.
- L-configuration means that the -OH or -NH2 group is on the left side of the second last carbon (the penultimate carbon) when the most oxidized group is at the top.

### Step 2: Identify the Most Oxidized Group
- For each compound, identify the most oxidized group (usually a carbonyl group, -CHO, or -COOH) and place it at the top of the structure.

### Step 3: Locate the Second Last Carbon
- Once the structure is oriented correctly, locate the second last carbon atom in the chain.

### Step 4: Determine the Position of the Functional Group
- Check the position of the hydroxyl (-OH) or amino (-NH2) group on the second last carbon:
- If it is on the left side, the configuration is L.
- If it is on the right side, the configuration is D.

### Step 5: Analyze Each Option
- Go through each option provided in the question and apply the above steps to determine the configuration.

### Step 6: Conclusion
- After analyzing all options, identify which compound has the -OH or -NH2 group on the left side of the second last carbon. This compound will have the L-configuration.

### Example Analysis:
Let’s say we have the following options:
- **Option A**: Configuration shows -OH on the right side of the second last carbon → D-configuration.
- **Option B**: Configuration shows -NH2 on the right side of the second last carbon → D-configuration.
- **Option C**: Configuration shows -OH on the left side of the second last carbon → L-configuration.
- **Option D**: Configuration shows -OH on the right side of the second last carbon → D-configuration.

From this analysis, **Option C** is the correct answer as it has the L-configuration.

### Final Answer:
**Option C** has the L-configuration.

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