Which of the following reaction gives different product than the other three –

Options

A. `C_(6)H_(5)CH_(3) underset((ii)H_(2)O)overset((i)CrO_(2)Cl_(2)CS)to `
B. `C_(6)H_(6)+CO+HCl underset(AlCl_(3)) overset("anhydrous") to `
C. `C_(6)H_(5)-CH(CH_(3))_(2) underset(H^(+)) overset(MnO_(4)^(-)) to`
D. `C_(6)H_(5)COCl+H_(2) overset(Pd//BaSO_(4)) to `

Answer

To solve the question of which reaction gives a different product than the other three, we will analyze each option step by step.

### Step 1: Analyze Option 1
- **Reaction**: C6H5CH3 (Toluene) with Chromyl Chloride (CrO2Cl2) followed by hydrolysis (water).
- **Product**: This reaction converts to Benzoic Acid (C6H5COOH).

### Step 2: Analyze Option 2
- **Reaction**: C6H6 (Benzene) with Anhydrous Aluminum Chloride (AlCl3).
- **Product**: This reaction also leads to the formation of Benzoic Acid (C6H5COOH). This is known as the Kolbe reaction.

### Step 3: Analyze Option 3
- **Reaction**: C6H5 (Benzene) with Acidified Potassium Permanganate (KMnO4).
- **Product**: This reaction will also yield Benzoic Acid (C6H5COOH).

### Step 4: Analyze Option 4
- **Reaction**: C6H5COCl (Benzoyl Chloride) with Palladium (Pd) and Barium Sulfate (BaSO4).
- **Product**: This reaction converts Benzoyl Chloride into Benzaldehyde (C6H5CHO).

### Conclusion
- **Different Product**: The product from Option 4 is Benzaldehyde, while the products from Options 1, 2, and 3 are all Benzoic Acid. Thus, the reaction that gives a different product is **Option 4**.

### Final Answer
The answer to the question is **Option 4** (Benzaldehyde).

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