The IUPAC of `CH_(2)=CH-CH_(2)Cl` is

Options

A. Ally] chloride
B. l-Chloro-3-propene
C. Vinyl chloride
D. 3-Chloro-1-propene

Explanation

To determine the IUPAC name of the compound `CH₂=CH-CH₂Cl`, we can follow these steps:

### Step 1: Identify the longest carbon chain
The compound has three carbon atoms connected in a chain. The longest chain is therefore a three-carbon chain.

**Hint:** Look for the longest continuous chain of carbon atoms to determine the base name.

### Step 2: Determine the base name
Since the longest chain has three carbon atoms, the base name is "propane".

**Hint:** The base name is derived from the number of carbon atoms in the longest chain (1 carbon = methane, 2 carbons = ethane, 3 carbons = propane, etc.).

### Step 3: Identify the functional groups and substituents
The compound has a double bond (indicated by `=`) and a chlorine atom (Cl) attached to one of the carbon atoms. The presence of the double bond means we will use the suffix "-ene" in the name.

**Hint:** Identify any functional groups or substituents that need to be included in the name.

### Step 4: Number the carbon chain
We need to number the carbon atoms in the chain starting from the end closest to the double bond. This ensures that the double bond gets the lowest possible number.

- Numbering from left to right:
1. C1: CH₂ (part of the double bond)
2. C2: CH (part of the double bond)
3. C3: CH₂ (with Cl attached)

**Hint:** Always number the chain in a way that gives the lowest numbers to the double bond and substituents.

### Step 5: Assign locants to the substituents
The chlorine atom is attached to the third carbon (C3), and the double bond is between the first and second carbons.

**Hint:** Use locants (numbers) to specify where substituents and functional groups are located on the carbon chain.

### Step 6: Write the complete IUPAC name
Combining all the information:
- The base name is "propene" (due to the double bond).
- The chlorine substituent is on carbon 3.
- Therefore, the full name is "3-chloroprop-1-ene".

**Hint:** Combine the substituent names and locants with the base name in the correct order.

### Final Answer
The IUPAC name of `CH₂=CH-CH₂Cl` is **3-chloroprop-1-ene**.