Which halide does not get hydrolysed by sodium hydroxide?

Options

A. Vinyl chloride
B. Methyl Chloride
C. Ethyl chloride
D. Isopropyl chloride

Answer

To determine which halide does not get hydrolyzed by sodium hydroxide, we need to analyze each of the given halides: vinyl chloride, methyl chloride, ethyl chloride, and isopropyl chloride.

### Step-by-Step Solution:

1. **Identify the Halides**: The halides given are:
- Vinyl chloride (CH2=CHCl)
- Methyl chloride (CH3Cl)
- Ethyl chloride (C2H5Cl)
- Isopropyl chloride (CH3CHClCH3)

2. **Understand Hydrolysis**: Hydrolysis is a chemical reaction involving the breaking of a bond in a molecule using water. In this case, we are looking at the reaction of these halides with sodium hydroxide (NaOH).

3. **Analyze Vinyl Chloride**:
- Structure: Vinyl chloride has a double bond (C=C) and is sp² hybridized.
- The C-Cl bond in vinyl chloride is stronger due to the higher s-character of the hybridized carbon (33% s-character).
- The presence of the double bond allows for resonance stabilization, making the C-Cl bond even more difficult to break.
- **Conclusion**: Vinyl chloride does not undergo hydrolysis with sodium hydroxide.

4. **Analyze Methyl Chloride**:
- Structure: Methyl chloride is a simple alkyl halide (CH3Cl).
- It can easily react with sodium hydroxide to form methanol (CH3OH) and sodium chloride (NaCl).
- **Conclusion**: Methyl chloride does get hydrolyzed.

5. **Analyze Ethyl Chloride**:
- Structure: Ethyl chloride (C2H5Cl) is another primary alkyl halide.
- It also reacts with sodium hydroxide to produce ethanol (C2H5OH) and sodium chloride (NaCl).
- **Conclusion**: Ethyl chloride does get hydrolyzed.

6. **Analyze Isopropyl Chloride**:
- Structure: Isopropyl chloride (CH3CHClCH3) is a secondary alkyl halide.
- It reacts with sodium hydroxide to form isopropanol (CH3CHOHCH3) and sodium chloride (NaCl).
- **Conclusion**: Isopropyl chloride does get hydrolyzed.

7. **Final Conclusion**: Among the halides analyzed, only vinyl chloride does not undergo hydrolysis with sodium hydroxide. Therefore, the correct answer is **vinyl chloride**.