The compound that would undergo hydration very easily is

Options

A. `CH_(3)COCH_(2)Cl`
B. `CH_(3)CH_(2)CHO`
C. `Cl_3C-CHO`
D. `Cl_(3)C CH_(2)COCH_(3)`

Answer

To determine which compound undergoes hydration very easily, we need to analyze the given compounds based on their structure and the presence of functional groups, particularly focusing on the influence of chloro groups and the type of carbonyl group (aldehyde or ketone).

### Step-by-Step Solution:

1. **Identify the Compounds**:
- We have four compounds to consider:
1. Compound 1: Contains one keto group and one chloro group.
2. Compound 2: Contains one aldehyde group (no chloro groups).
3. Compound 3: Contains one aldehyde group with three chloro groups.
4. Compound 4: Contains one keto group with three chloro groups.

2. **Understand the Role of Chloro Groups**:
- Chloro groups are electron-withdrawing groups. Their presence increases the electrophilicity of the carbonyl carbon, making it more susceptible to nucleophilic attack, which is essential for hydration.

3. **Analyze Each Compound**:
- **Compound 1**: Has one chloro group and one keto group. Moderate potential for hydration.
- **Compound 2**: Has no chloro groups. Least likely to undergo hydration.
- **Compound 3**: Has three chloro groups and one aldehyde group. High potential for hydration due to multiple electron-withdrawing groups.
- **Compound 4**: Has three chloro groups and one keto group. Also has a high potential for hydration but is influenced by the presence of a methyl group.

4. **Compare Compounds 3 and 4**:
- Both compounds have three chloro groups, but Compound 4 has a methyl group that exerts a +I (inductive) effect, which can decrease the electrophilicity of the carbonyl carbon, making it less favorable for hydration compared to Compound 3.

5. **Conclusion**:
- Based on the analysis, Compound 3, which has three chloro groups and an aldehyde, will undergo hydration very easily due to the strong electron-withdrawing effect of the chloro groups without the counteracting +I effect from a methyl group.

### Final Answer:
The compound that would undergo hydration very easily is **Compound 3**.

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