Phenol reacts with `PCI_(5)`, the main product is:

Options

A. PhCI
B. `Ph-O-overset(O)overset(||)underset(CI)underset(|)P-CI`
C. `Ph-O-overset(O)overset(||)underset(CI)underset(|)P-O-Ph`
D. `Ph-O-overset(O)overset(||)underset(OPh)underset(|)P-O-Ph`

Explanation

To determine the main product formed when phenol reacts with phosphorus pentachloride (PCl₅), we can follow these steps:

### Step 1: Understand the Reactants
Phenol (C₆H₅OH) is an aromatic alcohol, and phosphorus pentachloride (PCl₅) is a chlorinating agent. When phenol reacts with PCl₅, it can undergo chlorination.

**Hint:** Identify the functional groups in the reactants to understand how they will interact.

### Step 2: Reaction Conditions
For the reaction to occur effectively, phenol must be present in excess. This is crucial because if PCl₅ is in excess, it can lead to the formation of different products, including chlorinated phenols.

**Hint:** Consider the stoichiometry of the reactants and how the excess of one can influence the reaction.

### Step 3: Reaction Mechanism
When phenol reacts with PCl₅, the hydroxyl group (-OH) of phenol is replaced by a chlorine atom (Cl). However, with excess phenol, the reaction can continue, leading to the formation of triphenyl phosphate.

**Hint:** Think about how the hydroxyl group can be substituted and what happens when there is excess phenol.

### Step 4: Identify the Product
The main product formed when phenol reacts with PCl₅ in the presence of excess phenol is triphenyl phosphate (C₁₂H₁₅Cl₃O₄P). The reaction can be summarized as follows:
- Phenol + PCl₅ → Triphenyl phosphate + HCl

**Hint:** Look for the structural formula of triphenyl phosphate to confirm its identity.

### Step 5: Conclusion
Thus, the main product of the reaction between phenol and phosphorus pentachloride, when phenol is in excess, is triphenyl phosphate.

**Final Answer:** Triphenyl phosphate (C₁₂H₁₅Cl₃O₄P).