Which of the following reactions does not lead to formation of an alkanol ?

Options

A. `RCOOR + KOH to`
B. `R_(2) O + H_(2) O underset (Delta) overset(dil//H_(2) SO_(4))to `
C. `RCOR ' +2H overset(NA+ "ethanol") to `
D. `(RCO)_(2) O + H_(2) O to`

Answer

To determine which of the following reactions does not lead to the formation of an alkanol (alcohol), we will analyze each reaction step by step.

### Step 1: Analyze the First Reaction
**Reaction:** RCOR + KOH (Hydrolysis of Ester)

- **Explanation:** Here, RCOR represents an ester. When an ester undergoes hydrolysis in the presence of potassium hydroxide (KOH), it breaks down to form a carboxylic acid (RC(=O)OH) and an alcohol (ROH).
- **Conclusion:** This reaction produces an alcohol, so it is not the answer.

### Step 2: Analyze the Second Reaction
**Reaction:** ROR + H2O (Hydrolysis of Ether)

- **Explanation:** In this case, ROR represents an ether. When ether undergoes hydrolysis (typically in the presence of an acid), it can yield two molecules of the same alcohol if both R groups are identical or two different alcohols if the R groups are different.
- **Conclusion:** This reaction also produces alcohol, so it is not the answer.

### Step 3: Analyze the Third Reaction
**Reaction:** RCO + H2 (Reduction of Ketone)

- **Explanation:** Here, RCO represents a ketone. When a ketone undergoes reduction (for example, using sodium in ethanol), it can form a secondary alcohol.
- **Conclusion:** This reaction produces an alcohol, so it is not the answer.

### Step 4: Analyze the Fourth Reaction
**Reaction:** RCO2R' (Anhydride Hydrolysis)

- **Explanation:** In this case, RCO2R' represents an anhydride. When an anhydride undergoes hydrolysis, it typically yields two molecules of the corresponding carboxylic acid (RC(=O)OH) and does not produce any alcohol.
- **Conclusion:** This reaction does not produce an alcohol, making it the correct answer.

### Final Answer
The reaction that does not lead to the formation of an alkanol is the hydrolysis of an anhydride (RCO2R').

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