Methanol can be distinguished from ethanol by the following except :

Options

A. Reaction with iodine and alkali
B. Reaction with salicylic acid and `H_(2)SO_(4)`
C. Reaction with Lucas reagent
D. Boiling point

Answer

To solve the question "Methanol can be distinguished from ethanol by the following except:", we will analyze the reactions mentioned and determine which one does not allow for the differentiation between methanol and ethanol.

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify which of the given reactions does NOT distinguish between methanol (CH3OH) and ethanol (C2H5OH).

2. **Analyze the First Reaction - Iodine and Alkali**:
- Methanol does not undergo the iodiform reaction, while ethanol does.
- Ethanol reacts with iodine in the presence of alkali to produce methyl ketone (acetone), whereas methanol does not produce any such product.
- **Conclusion**: This reaction can distinguish between methanol and ethanol.

3. **Analyze the Second Reaction - Salicylic Acid and Sulfuric Acid**:
- When methanol reacts with salicylic acid in the presence of sulfuric acid, it forms methyl salicylate, which has a characteristic smell (oil of wintergreen).
- Ethanol also reacts to form the same product but does not have the same smell.
- **Conclusion**: This reaction can also distinguish between methanol and ethanol.

4. **Analyze the Third Reaction - Lucas Reagent**:
- Lucas reagent is used to differentiate between primary, secondary, and tertiary alcohols.
- Both methanol and ethanol are primary alcohols, and when treated with Lucas reagent, neither will react at room temperature, resulting in no precipitate.
- **Conclusion**: This reaction cannot distinguish between methanol and ethanol.

5. **Analyze the Fourth Reaction - Boiling Point**:
- The boiling point of methanol is 65°C, while that of ethanol is 78°C.
- By measuring the boiling point, one can easily distinguish between the two.
- **Conclusion**: This method can distinguish between methanol and ethanol.

6. **Final Answer**:
- The reaction that does NOT distinguish methanol from ethanol is the **reaction with Lucas reagent**.

### Summary:
The answer to the question is the **reaction with Lucas reagent**, as both methanol and ethanol are primary alcohols and do not react with it at room temperature.