The correct IUPAC name from the incorrect name 4-Amino-3-hydroxy-2-butene is :-

Options

A. 1-Amino-2-hydroxy-2-butene
B. 4-Amino-2-buten-3-ol
C. 1-Amino-2-buten-2-ol
D. 1-Amino-2-butenol

Answer

To find the correct IUPAC name for the compound originally named 4-Amino-3-hydroxy-2-butene, we will follow these steps:

### Step 1: Draw the Structure
First, we need to draw the structure based on the given name. The name indicates:
- A butene (four carbon atoms) with a double bond.
- An amino group (-NH2) at position 4.
- A hydroxy group (-OH) at position 3.

The structure can be represented as follows:
- Carbon chain: C1-C2=C3-C4
- Positioning the groups:
- C4 has the amino group (NH2).
- C3 has the hydroxy group (OH).
- C2 has the double bond.

### Step 2: Number the Carbon Chain
According to IUPAC rules, we need to number the carbon chain in a way that gives the highest priority functional groups the lowest possible numbers. In this case, the amino group has higher priority than the hydroxy group.

- Start numbering from the end closest to the amino group:
- C1 (NH2)
- C2 (C=C)
- C3 (OH)
- C4

### Step 3: Write the Correct IUPAC Name
Now that we have the correct numbering:
- The amino group is at position 1.
- The hydroxy group is at position 3.
- The double bond is between C2 and C3.

Thus, the correct IUPAC name is:
**1-Amino-3-hydroxy-2-butene**

### Final Answer
The correct IUPAC name for the compound originally named 4-Amino-3-hydroxy-2-butene is **1-Amino-3-hydroxy-2-butene**.

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