The correct IUPAC name of `CH_(2)= CH-CH_(2)NHCH_(3) is :`

Options

A. Allymethyl amine
B. 2-amino -4-pentene
C. 4-aminopent-lene
D. N-methylprop-2-en-anine

Answer

To determine the correct IUPAC name of the compound `CH2=CH-CH2-NH-CH3`, we will follow a systematic approach.

### Step-by-Step Solution:

1. **Identify the Longest Carbon Chain**:
- The given structure has a double bond between the first two carbon atoms and a nitrogen atom connected to the carbon chain. The longest carbon chain consists of three carbon atoms (C1, C2, and C3).
- So, the longest carbon chain is:
- CH2 (C1) = CH (C2) - CH2 (C3).

2. **Number the Carbon Atoms**:
- We will number the carbon chain starting from the end closest to the double bond to give the double bond the lowest possible number.
- Therefore, the numbering is as follows:
- C1 (CH2) - C2 (CH) - C3 (CH2).
- This gives us the positions: C1 = 1, C2 = 2, C3 = 3.

3. **Identify the Substituents**:
- There is a methyl group (CH3) attached to the nitrogen (NH). This is a substituent that we need to consider.
- The nitrogen atom is connected to the carbon chain and has a methyl group attached to it, making it an N-methyl substituent.

4. **Determine the Main Functional Group**:
- The main functional group here is the amine (NH), which will be indicated as "amine" in the name.

5. **Construct the Name**:
- The substituent (N-methyl) comes first, followed by the name of the longest carbon chain (prop) indicating three carbon atoms.
- Since there is a double bond between C1 and C2, we indicate this with "2" (indicating the position of the double bond).
- Finally, we add the suffix for the amine functional group.

6. **Final Assembly of the IUPAC Name**:
- Combining all parts, we get:
- N-methyl (substituent) + prop (for the three carbon chain) + 2 (for the position of the double bond) + amine (for the amine functional group).
- Therefore, the IUPAC name is **N-methylprop-2-amine**.

### Final Answer:
The correct IUPAC name of `CH2=CH-CH2-NH-CH3` is **N-methylprop-2-amine**.