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 of how methanol can be distinguished from ethanol, we will analyze the options provided and determine which one does not allow for a distinction between the two alcohols.

### Step-by-Step Solution:

1. **Understand the Properties of Methanol and Ethanol**:
- Methanol (CH3OH) and ethanol (C2H5OH) are both alcohols but have different structures and properties.

2. **Evaluate the Options**:
- We need to consider each option provided in the question to see if it can distinguish methanol from ethanol.

3. **Option 1: Reaction with Iodine and Alkali (Iodoform Reaction)**:
- The iodoform reaction occurs with compounds that have a methyl ketone group. Ethanol can undergo this reaction, producing iodoform, while methanol cannot. Therefore, this option can distinguish methanol from ethanol.

4. **Option 2: Reaction with Salicylic Acid in the Presence of Sulfuric Acid**:
- When methanol reacts with salicylic acid, it forms methyl salicylate, which has a distinct smell (oil of wintergreen). Ethanol reacts similarly to produce ethyl salicylate, which does not have the same smell. Thus, this option can also distinguish between the two.

5. **Option 3: Reaction with Lucas Reagent**:
- Lucas reagent is used to differentiate between primary, secondary, and tertiary alcohols. Both methanol and ethanol are primary alcohols and do not react with Lucas reagent at room temperature. Therefore, this option cannot distinguish between methanol and ethanol.

6. **Option 4: Boiling Point**:
- Methanol has a boiling point of 65°C, while ethanol has a boiling point of 78°C. This difference in boiling points allows for a clear distinction between the two alcohols.

7. **Conclusion**:
- The question asks for the option that does NOT allow for a distinction between methanol and ethanol. The correct answer is **Option 3: Reaction with Lucas Reagent**, as both methanol and ethanol do not react with it.

### Final Answer:
Methanol can be distinguished from ethanol by the following except: **Reaction with Lucas Reagent**.