Which carbonyl compound will not give addition reaction with water ?

Options

A. `C Cl_3CHO`
B. `CF_3CHO`
C. `CH_3-overset(O)overset(||)(C )-CH_3`
D. `CF_3-overset(O)overset(||)(C )-CF_3`

Answer

To solve the question "Which carbonyl compound will not give addition reaction with water?", we will analyze each option provided and determine whether they will undergo an addition reaction with water.

### Step-by-Step Solution:

1. **Identify the Carbonyl Compounds**:
The question provides four options, which are carbonyl compounds. We need to analyze each one.

2. **Analyze Option A: CCl3CHO (Trichloroacetaldehyde)**:
- When water is added to CCl3CHO, it can undergo an addition reaction to form CCl3COH and OH.
- The -I (inductive) effect of the CCl3 group stabilizes the resulting hydroxyl group, allowing the addition to occur.
- **Conclusion**: Addition reaction occurs.

3. **Analyze Option B: CF3CHO (Trifluoroacetaldehyde)**:
- Similar to option A, the addition of water leads to the formation of CF3COH and OH.
- The -I effect of the CF3 group also stabilizes the resulting hydroxyl group, facilitating the addition.
- **Conclusion**: Addition reaction occurs.

4. **Analyze Option C: CH3C(=CH2) (Isobutylene)**:
- In this case, when water is added, the compound can rearrange and lose water instead of adding it, leading to a different product.
- The +I (inductive) effect of the CH3 groups donates electrons, making it less favorable for water to add.
- **Conclusion**: No addition reaction occurs.

5. **Analyze Option D: CF3C(=CF3)**:
- This compound also has the CF3 groups, which exert a strong -I effect.
- The addition of water would lead to the formation of CF3C(OH) and CF3, and the -I effect stabilizes the resulting hydroxyl groups.
- **Conclusion**: Addition reaction occurs.

6. **Final Conclusion**:
After analyzing all options, the carbonyl compound that will not give an addition reaction with water is **Option C: CH3C(=CH2)**.