Acetaldehyde on treatment with HCN forms a cyanohydrin. What will be the product if this cyanohydrin is further hydrolysed ?

Options

A. `CH_(3)`COOH
B.
C.
D. `CH_(3) CH_(2)`OH

Explanation

To solve the question, we need to follow these steps:

### Step 1: Understand the Reactants
We start with acetaldehyde, which has the chemical structure CH3CHO. Acetaldehyde is an aldehyde, and when it reacts with hydrogen cyanide (HCN), it will form a cyanohydrin.

### Step 2: Reaction with HCN
In the presence of HCN, the cyanide ion (CN⁻) acts as a nucleophile and attacks the electrophilic carbon atom of the carbonyl group in acetaldehyde. This leads to the formation of a cyanohydrin.

The reaction can be represented as follows:
\[ \text{CH}_3\text{CHO} + \text{HCN} \rightarrow \text{CH}_3\text{C(OH)(CN)} \]

This product is known as 2-cyanoethanol.

### Step 3: Hydrolysis of the Cyanohydrin
Next, we need to consider what happens when the cyanohydrin undergoes hydrolysis. Hydrolysis involves the addition of water (H2O) to the cyanohydrin, which will convert the cyano group (CN) into a carboxylic acid (COOH).

The hydrolysis reaction can be represented as follows:
\[ \text{CH}_3\text{C(OH)(CN)} + \text{H}_2\text{O} \rightarrow \text{CH}_3\text{C(OH)(COOH)} \]

### Step 4: Final Product
After hydrolysis, the cyanohydrin will yield the corresponding carboxylic acid. In this case, the product will be:
\[ \text{CH}_3\text{COOH} \]
which is acetic acid.

### Conclusion
Thus, the final product after hydrolysis of the cyanohydrin formed from acetaldehyde and HCN is acetic acid (CH3COOH).