Which of the inter- molecular dehydration ?

Options

A. `ROH to R - OR`
B. `ROH to R - X`
C. `ROH to ` alkene
D. `R - X to ROH`

Answer

To solve the question regarding which of the given reactions represents intermolecular dehydration, we will analyze the options step by step.

### Step 1: Understand the concept of dehydration
Dehydration is a chemical reaction that involves the removal of a water molecule (H₂O) from a compound. In the context of alcohols, dehydration can occur either intramolecularly (within the same molecule) or intermolecularly (between two molecules).

**Hint:** Remember that intermolecular dehydration involves two separate molecules, while intramolecular dehydration involves a single molecule.

### Step 2: Analyze the options
Let's consider the options provided in the question (though they are not explicitly listed here, we will assume common types of reactions involving alcohols):

1. **Option A: Alcohol + Alcohol → Ether + H₂O**
- This reaction involves two alcohol molecules combining and losing a water molecule to form an ether. This is a classic example of intermolecular dehydration.

2. **Option B: Alcohol + HX → Alkyl Halide + H₂O**
- This reaction involves the substitution of the hydroxyl group (OH) in alcohol with a halogen (X). While water is produced, this is not a dehydration reaction in the context of forming ethers and does not involve two alcohol molecules.

3. **Option C: Alcohol → Alkene + H₂O**
- This reaction involves the dehydration of a single alcohol molecule to form an alkene. This is an example of intramolecular dehydration, as the water is removed from the same molecule.

4. **Option D: Alcohol + X → Alcohol with X instead of OH**
- This represents a nucleophilic substitution reaction where the hydroxyl group is replaced by a halogen. This is not a dehydration reaction.

### Step 3: Identify the correct option
From the analysis above:
- **Option A** is the only reaction that represents intermolecular dehydration since it involves two alcohol molecules reacting to form an ether with the elimination of water.

**Conclusion:** The correct answer is **Option A**.

### Summary of Steps:
1. Understand the concept of dehydration (intermolecular vs intramolecular).
2. Analyze each option based on the type of reaction and the molecules involved.
3. Identify the option that represents intermolecular dehydration.