Gem-dibromide on hydrolysis will give:

Options

A. Glycols
B. Aldehydes or ketones
C. Alcohols
D. Epoxides

Answer

To solve the question about what gem-dibromide will yield upon hydrolysis, we can follow these steps:

### Step 1: Understand the Structure of Gem-Dibromide
Gem-dibromides are compounds where two bromine atoms are attached to the same carbon atom. For example, let's consider 1,1-dibromoethane, which has the structure:

```
Br
|
H3C-C- Br
|
H
```

### Step 2: Hydrolysis Reaction
When gem-dibromide undergoes hydrolysis, it typically reacts with a nucleophile such as hydroxide ion (OH⁻) from sodium hydroxide (NaOH). The bromine atoms are more electronegative than carbon, which creates a partial positive charge on the carbon atom.

### Step 3: Nucleophilic Attack
The hydroxide ion (OH⁻) will attack the carbon atom bonded to the bromine. This leads to the cleavage of the C-Br bond, resulting in the formation of an alcohol group (OH) and the release of a bromide ion (Br⁻). The reaction can be illustrated as follows:

```
OH
|
H3C-C- Br + OH⁻ → H3C-C(OH)- Br + Br⁻
|
H
```

### Step 4: Further Hydrolysis
Since we have two hydroxyl groups (OH) on the same carbon, this configuration is unstable. The molecule will undergo dehydration, where a water molecule (H₂O) is eliminated, leading to the formation of an aldehyde or a ketone.

For example, in the case of 1,1-dibromoethane, after the first hydrolysis, we have:

```
OH
|
H3C-C(OH)- Br
|
H
```

Upon dehydration, we can form acetaldehyde (an aldehyde):

```
O
||
H3C-C-H
```

### Step 5: Generalization for Other Gem-Dibromides
For other gem-dibromides, like 2,2-dibromopropane, the same process occurs. The hydrolysis will lead to the formation of a ketone after dehydration.

### Conclusion
Therefore, upon hydrolysis, gem-dibromides can yield either aldehydes or ketones depending on the structure of the starting material.

### Final Answer
Gem-dibromide on hydrolysis will give either aldehydes or ketones.

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