Which one of the following pairs is not correctly matched ?

Options

A. `gt C =O overset("Clemmensen's Reduction")(rarr) gt CH_(2)`
B. `gt C = O overset( "Wolf Kishner Reduction ")( rarr) gt CHOH`
C. `-COCl overset( "Rosenmund's Reduction")(rarr)-CHO`
D. `-C-= Noverset( "Stephan's Reduction")(rarr) -CHO`

Answer

To solve the question regarding which pair is not correctly matched, we need to analyze the reduction reactions mentioned and their corresponding reagents.

### Step-by-Step Solution:

1. **Identify the Reactions and Their Reagents**:
- **Clemensen Reduction**: This reaction involves the reduction of carbonyl compounds (like aldehydes and ketones) to hydrocarbons using zinc amalgam and hydrochloric acid (HCl).
- **Wolf-Krishner Reduction**: This reaction also reduces carbonyl compounds to hydrocarbons, typically using hydrazine (NH2NH2) followed by a strong base like potassium hydroxide (KOH) in the presence of ethylene glycol.
- **Rosenmund Reduction**: This reaction involves the reduction of acyl chlorides to aldehydes using palladium on barium sulfate (BaSO4) as a catalyst.
- **Strecker Reduction**: This reaction reduces nitriles to aldehydes using tin(II) chloride (SnCl2) in the presence of hydrochloric acid (HCl).

2. **Analyze Each Pair**:
- **Clemensen Reduction**: Correctly matched with zinc amalgam and HCl.
- **Wolf-Krishner Reduction**: The pair is incorrectly matched as it is stated to yield an alcohol, but it actually yields a hydrocarbon.
- **Rosenmund Reduction**: Correctly matched with acyl chloride to aldehyde.
- **Strecker Reduction**: Correctly matched with nitrile to aldehyde.

3. **Conclusion**:
The pair that is not correctly matched is **Wolf-Krishner Reduction**, which is incorrectly stated to yield an alcohol instead of a hydrocarbon.

### Final Answer:
The incorrect pair is **Wolf-Krishner Reduction** yielding alcohol instead of hydrocarbon.

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