In which of the following, the product is not correct?

Options

A. `CH_(3)CHO overset(LiAlH_(4))rarrCH_(3)CH_(2)OH`
B. `CH_(3)COCH_(3)underset(HCl)overset(Zn-Hg)rarrCH_(3)-underset(OH)underset(|)(C)H-CH_(3)`
C. `CH_(3)CH_(2)CHOoverset((i)NH_(2)-NH_(2))underset((ii)KOH,(OH-CH_(2)-CH_(2)-OH))rarrCH_(3)CH_(2)CH_(3)`
D. `CH_(3)CH_(2)CHOoverset(KMnO_(4))rarrCH_(3)CH_(2)COOH`

Explanation

To solve the question, we need to analyze the given reactions and identify which product is incorrect. Let's break down the steps involved in determining the correct answer.

### Step-by-Step Solution:

1. **Analyze the First Reaction:**
- **Reactant:** Ethanol (an aldehyde).
- **Reagent:** Lithium Aluminum Hydride (LiAlH4).
- **Process:** Reduction.
- **Expected Product:** Ethanol will be reduced to a primary alcohol, which is ethanol itself.
- **Conclusion:** This reaction is correct.

2. **Analyze the Second Reaction:**
- **Reactant:** Acetone (a ketone).
- **Reagent:** Zinc amalgam and HCl (Clemensen reduction).
- **Process:** Reduction to an alkane.
- **Expected Product:** Acetone will be converted to propane (CH3-CH2-CH3).
- **Given Product:** Propan-2-ol.
- **Conclusion:** The product given (propan-2-ol) is incorrect. The correct product is propane.

3. **Analyze the Third Reaction:**
- **Reactant:** Propanal (an aldehyde).
- **Reagent:** Hydrazine and KOH (Wolff-Kishner reduction).
- **Process:** Reduction to an alkane.
- **Expected Product:** Propanal will be reduced to propane (CH3-CH2-CH3).
- **Conclusion:** This reaction is correct.

4. **Analyze the Fourth Reaction:**
- **Reactant:** Propanal (an aldehyde).
- **Reagent:** Potassium permanganate (KMnO4).
- **Process:** Oxidation.
- **Expected Product:** Propanal will be oxidized to propanoic acid (CH3-CH2-COOH).
- **Conclusion:** This reaction is correct.

5. **Final Conclusion:**
- The only incorrect product is from the second reaction, where acetone was incorrectly stated to produce propan-2-ol instead of propane.

### Answer:
The reaction with the incorrect product is the **second reaction**.