IUPAC name of Glycine is

Options

A. 2-amino propanoic acid
B. 2-amino butanoic acid
C. 2-amino ethanoic acid
D. 2-amino pent-1, 5-dioic acid

Answer

To determine the IUPAC name of glycine, we will follow a systematic approach. Here are the steps:

### Step 1: Identify the Structure of Glycine
Glycine is the simplest amino acid. Its structure can be represented as:
- NH2 (amine group)
- CH2 (central carbon)
- COOH (carboxylic acid group)

The complete structure is NH2-CH2-COOH.

### Step 2: Determine the Longest Carbon Chain
In the structure of glycine, we have two carbon atoms:
1. The carbon in the carboxylic acid (COOH)
2. The carbon in the amine group (NH2)

Thus, the longest carbon chain consists of 2 carbon atoms.

### Step 3: Identify the Parent Alkane
With 2 carbon atoms, the parent alkane is ethane (C2H6).

### Step 4: Number the Carbon Atoms
We need to number the carbon atoms in such a way that the functional groups get the lowest possible numbers. In glycine:
- The carboxylic acid group (COOH) is given priority and is assigned the number 1.
- The amine group (NH2) is attached to the second carbon.

So, we have:
1. Carbon 1: COOH (carboxylic acid)
2. Carbon 2: NH2 (amine)

### Step 5: Naming the Functional Groups
- The carboxylic acid group indicates that we will use the suffix "-oic acid" for the parent alkane.
- The amine group at carbon 2 is indicated by the prefix "2-amino".

### Step 6: Combine the Names
Now, we combine the information:
- The parent alkane is ethane.
- Replace the 'e' in ethane with 'oic acid' to get "ethanoic acid".
- Add the prefix for the amine group: "2-amino".

Thus, the IUPAC name of glycine is **2-aminoethanoic acid**.

### Final Answer
The IUPAC name of glycine is **2-aminoethanoic acid**.

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