IUPAC name of serine is

Options

A. 2-Aminoethanoic acid
B. 2-Aminopripanoic acid
C. 2-Amino-3-hydroxypropanoic acid
D. 2-Amino-3-mercaptopropanoic

Answer

To determine the IUPAC name of serine, we can follow these steps:

### Step 1: Identify the Structure of Serine
The molecular formula of serine is C3H7NO3. The structure can be represented as HOCH2-CH(NH2)-COOH. This shows that serine contains an amino group (-NH2), a carboxylic acid group (-COOH), and a hydroxyl group (-OH) attached to the second carbon.

### Step 2: Determine the Longest Carbon Chain
In the structure, we can see that there are three carbon atoms in the main chain. The longest carbon chain is a propanoic acid chain because it contains three carbon atoms.

### Step 3: Identify Functional Groups
- The presence of an amino group (-NH2) indicates that this is an amino acid.
- The presence of a hydroxyl group (-OH) indicates that this is a hydroxy acid.

### Step 4: Number the Carbon Chain
We start numbering the carbon chain from the carboxylic acid end (which is the highest priority functional group). Therefore, the carbon atoms are numbered as follows:
1. Carboxylic acid carbon (C1)
2. Alpha carbon with amino and hydroxyl groups (C2)
3. The last carbon in the chain (C3)

### Step 5: Assign the IUPAC Name
Based on the numbering:
- The amino group is on the second carbon (C2).
- The hydroxyl group is also on the second carbon (C2).
- The carboxylic acid group is on the first carbon (C1).

Thus, the IUPAC name is derived as follows:
- The base name is "propanoic acid" (due to three carbons).
- The amino group gives it the prefix "2-amino".
- The hydroxyl group gives it the prefix "3-hydroxy".

Putting it all together, the IUPAC name of serine is **2-amino-3-hydroxypropanoic acid**.

### Final Answer
The IUPAC name of serine is **2-amino-3-hydroxypropanoic acid**.

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