Which is incorrect match with respect to the reagent used for lab test ?

Options

A. Carbohydrates " " `rarr` " " `alpha`-Napthol (Molish reagent)
B. Nitro ethane " " `rarr` " " `Zn, NH_(4)Cl` and `AgNO_(3)` (Muliken Barker test)
C. Phenol " " `rarr` " " Anhydrous `ZnCl_(2)+Conc. HCl` (Lucas Reagent)
D. Benzoic acid " " `rarr` " " `NaHCO_(3)`

Explanation

To determine which of the given options is incorrectly matched with respect to the reagent used for lab tests, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Identify the first option**:
- **Test for Carbohydrates**: The reagent used is alpha naphthol (Mollisch's test).
- **Analysis**: This statement is correct. Carbohydrates can indeed be tested using alpha naphthol.

2. **Identify the second option**:
- **Test for Nitroethane**: The reagents used are zinc (Zn), ammonium chloride (NH4Cl), and silver nitrate (AgNO3) - known as the Malikin-Barker test.
- **Analysis**: This statement is also correct. Nitroethane does give a positive test with the Malikin-Barker test.

3. **Identify the third option**:
- **Test for Phenols**: The reagent mentioned is anhydrous ZnCl2 and concentrated HCl (Lucas reagent).
- **Analysis**: This statement is incorrect. Phenols are not tested using Lucas reagent; instead, phenols are tested using anhydrous FeCl3, which gives a violet or purple color. Lucas reagent is used for testing alcohols.

4. **Identify the fourth option**:
- **Test for Benzoic Acid**: The reagent used is sodium bicarbonate (NaHCO3).
- **Analysis**: This statement is correct. Benzoic acid can be tested with NaHCO3, which will produce carbon dioxide gas, indicating the presence of the acid.

### Conclusion:
After analyzing all the options, the incorrectly matched option is:
- **Option C**: Phenol is tested by anhydrous ZnCl2 and concentrated HCl (Lucas reagent) - this is incorrect.

### Final Answer:
**Option C is the incorrect match.**

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