Acetaldehyde cyanohydrin on hydrolysis gives lactic acid.

Answer

To determine whether the statement "Acetaldehyde cyanohydrin on hydrolysis gives lactic acid" is true or false, we will analyze the reaction step by step.

### Step-by-Step Solution:

1. **Identify Acetaldehyde Cyanohydrin Structure**:
- The structure of acetaldehyde cyanohydrin is CH3-CHOH-CN. This compound consists of an acetaldehyde group (CH3-CHO) and a cyanohydrin group (C-N).

2. **Understanding Hydrolysis**:
- Hydrolysis involves the reaction of a compound with water (H2O) and is often catalyzed by an acid (H+). In this case, we will consider the hydrolysis of the cyanohydrin.

3. **Mechanism of Hydrolysis**:
- The hydrolysis of acetaldehyde cyanohydrin can be initiated by the protonation of the cyanide nitrogen, which makes it more susceptible to nucleophilic attack.
- The nitrogen atom in the cyanohydrin has a lone pair of electrons and can attack a proton (H+) from the acid, leading to a positively charged nitrogen.

4. **Nucleophilic Attack by Water**:
- Water (H2O) acts as a nucleophile and attacks the carbon atom that is bonded to the cyanide group (C≡N). This results in the formation of a tetrahedral intermediate.

5. **Formation of Hydroxylamine**:
- After the nucleophilic attack, the intermediate rearranges, leading to the formation of a hydroxylamine derivative.

6. **Tautomerization**:
- The intermediate can undergo tautomerization, where the double bond shifts and results in the formation of a carbonyl group (C=O) and an amine group (NH2).

7. **Final Hydrolysis Step**:
- Another water molecule can attack the carbonyl carbon, leading to the formation of a diol (two hydroxyl groups) and eventually resulting in the formation of lactic acid (CH3-CHOH-COOH).

8. **Conclusion**:
- The final product of the hydrolysis of acetaldehyde cyanohydrin is indeed lactic acid, confirming that the statement is true.

### Final Answer:
The statement "Acetaldehyde cyanohydrin on hydrolysis gives lactic acid" is **True**.

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