IUPAC name of
`H_2N – CH_2 – CH_2 -NH_2` is

Options

A. Ethan – 1,2, diamine
B. Ethane – 1,2, diamine
C. Ethane – 1,1, diamine
D. Ethan – 1,2, diamine

Answer

To determine the IUPAC name of the compound `H2N – CH2 – CH2 - NH2`, follow these steps:

### Step 1: Identify the Parent Chain
The compound consists of a chain of carbon atoms with amino groups (-NH2) attached. The longest continuous chain of carbon atoms is identified first. In this case, the longest chain has 2 carbon atoms.

### Step 2: Number the Carbon Atoms
Number the carbon atoms in the parent chain starting from the end closest to the amino group. Here, we can number the carbon atoms as follows:
- Carbon 1: CH2 (attached to one NH2)
- Carbon 2: CH2 (attached to another NH2)

### Step 3: Identify the Functional Groups
The functional groups present in the compound are amino groups (-NH2). Since there are two amino groups, we will denote them in the name.

### Step 4: Assign Locants to the Amino Groups
Since both amino groups are attached to the first and second carbon atoms, we will assign the locants:
- The amino group on Carbon 1 is denoted as "1-amino".
- The amino group on Carbon 2 is denoted as "2-amino".

### Step 5: Combine the Information
Now, we combine the information:
- The parent chain with 2 carbon atoms is called "ethane".
- Since there are two amino groups, we use the prefix "di" to indicate this.

### Step 6: Write the Complete IUPAC Name
Putting it all together, the IUPAC name of the compound is **ethane-1,2-diamine**.

### Final Answer
The IUPAC name of `H2N – CH2 – CH2 - NH2` is **ethane-1,2-diamine**.

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