The IUPAC name of the compound
`H_(3)C-CH_(2)-underset(CH_(2))underset(||)(C)-CH_(2)-underset(NH_(2))underset(|)overset(OH)overset(|)(C)-CH_(3)` is

Options

A. 2-Amino- 4- ethyl -2 - hydroxypent - 4 - ene
B. 2-Amino - 4 - ethylpent - 4 - en - 2 - ol
C. 4-Ethyl - 2 - hydroxypent - 4 -en - 2 - amine
D. 2-Amino - 4 - methylhexan - 2 -ol

Answer

To determine the IUPAC name of the given compound, we will follow these steps:

### Step 1: Identify the longest carbon chain
The compound has a total of 5 carbon atoms in the main chain. We will identify the longest continuous chain of carbon atoms, which will serve as the parent hydrocarbon.

### Step 2: Identify the functional groups
The compound contains two functional groups:
1. Hydroxyl group (-OH)
2. Amino group (-NH2)

### Step 3: Determine the priority of functional groups
In IUPAC nomenclature, the hydroxyl group (-OH) has a higher priority than the amino group (-NH2). Therefore, we will number the carbon chain starting from the end closest to the -OH group.

### Step 4: Number the carbon chain
Starting from the end nearest to the -OH group:
1. C1: -OH
2. C2: -NH2
3. C3: -C (Ethyl group)
4. C4: -C
5. C5: -C (Methyl group)

### Step 5: Identify substituents and their positions
- The -OH group is on carbon 1 (1-ol).
- The -NH2 group is on carbon 2 (2-amino).
- The ethyl group (C2H5) is on carbon 4 (4-ethyl).

### Step 6: Combine the elements into the IUPAC name
Putting it all together, we have:
- The parent chain is pentane (5 carbons).
- The functional groups and substituents are named and numbered as follows: 2-amino, 4-ethyl, and 1-ol.

Thus, the complete IUPAC name is **2-amino-4-ethylpentan-1-ol**.

### Final Answer:
**2-amino-4-ethylpentan-1-ol**

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