The IUPAC name of the product formed when ethylene reacts with hypochlorous acid is

Options

A. Ethylene chlorohydrin
B. 2-Chloroethanol
C. 1-Chloroethanol
D. Hydroxyethyl chloride

Answer

To determine the IUPAC name of the product formed when ethylene reacts with hypochlorous acid, we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are:
- Ethylene (C₂H₄), which has the structure CH₂=CH₂.
- Hypochlorous acid (HOCl).

### Step 2: Understand the Reaction Mechanism
When ethylene reacts with hypochlorous acid, the double bond in ethylene acts as a nucleophile and attacks the electrophilic chlorine atom in hypochlorous acid. This results in the formation of a carbocation intermediate.

### Step 3: Formation of the Carbocation
The double bond in ethylene attacks the chlorine atom, leading to the formation of a primary carbocation:
- CH₂=CH₂ + HOCl → CH₂Cl-CH₂⁺ (carbocation)

### Step 4: Nucleophilic Attack by Hydroxide Ion
The hydroxyl group (OH) from hypochlorous acid, which is now in the form of a hydroxide ion (OH⁻), will then attack the carbocation. This results in the formation of the final product.

### Step 5: Determine the Structure of the Product
The product formed from this reaction is 2-chloroethanol, which has the following structure:
- CH₂Cl-CH₂OH

### Step 6: Assign the IUPAC Name
The IUPAC name for the product is 2-chloroethanol. This name indicates that there is a chlorine atom on the second carbon of the ethanol molecule.

### Final Answer
The IUPAC name of the product formed when ethylene reacts with hypochlorous acid is **2-chloroethanol**.

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