1, 1- Dichloropropane on hydrolysis gives :

Options

A. propanone
B. propanal
C. ethanal
D. 1, 1- Propanediol

Answer

To solve the question regarding the hydrolysis of 1,1-dichloropropane, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of 1,1-Dichloropropane**:
- The molecular structure of 1,1-dichloropropane is CH3-CHCl-CH2Cl. Here, both chlorine atoms are attached to the first carbon of the propane chain.

2. **Understand Hydrolysis**:
- Hydrolysis involves the reaction of a compound with water (H2O), where water can donate a hydroxyl group (OH-) and a hydrogen ion (H+). In this case, we will consider the nucleophilic attack by the hydroxide ion (OH-) from water.

3. **First Hydrolysis Step**:
- The hydroxide ion (OH-) attacks the carbon atom bonded to one of the chlorine atoms. This leads to the displacement of the chlorine atom (Cl) as a leaving group. The reaction can be represented as:
\[ CH3-CHCl-CH2Cl + OH^- \rightarrow CH3-CH(OH)-CH2Cl + Cl^- \]
- This produces 1-chloro-2-propanol (CH3-CH(OH)-CH2Cl).

4. **Second Hydrolysis Step**:
- The remaining chlorine atom on the first carbon can also be hydrolyzed in a similar manner. The hydroxide ion attacks the carbon again, leading to the removal of the second chlorine atom:
\[ CH3-CH(OH)-CH2Cl + OH^- \rightarrow CH3-CH(OH)-CH2OH + Cl^- \]
- This results in the formation of 1,2-propanediol (CH3-CH(OH)-CH2OH).

5. **Dehydration to Form Aldehyde**:
- The presence of two hydroxyl groups on the same carbon can lead to instability, prompting the removal of a water molecule (dehydration). This can be represented as:
\[ CH3-CH(OH)-CH2OH \rightarrow CH3-CH=O + H2O \]
- The product formed is propanal (an aldehyde).

6. **Final Product**:
- The final product after hydrolysis and dehydration of 1,1-dichloropropane is propanal (CH3-CH2-CHO).

### Conclusion:
- The hydrolysis of 1,1-dichloropropane ultimately yields propanal.