Chlorobenzene `overset("reaction X")rarr"Phenol"overset("reaction Y")rarr` salicylaldehyde
X and Y reactions are respectively:

Options

A. Fries rearrangement and kolbe - schmidt
B. Cumene and Reimer - Tiemann
C. Dow and Reimer - Tiemann
D. Dow and Friedal craft

Explanation

To convert chlorobenzene to phenol and then to salicylaldehyde, we need to identify the reactions involved, which are referred to as reaction X and reaction Y.

### Step-by-Step Solution:

1. **Identify Reaction X:**
- Chlorobenzene (C6H5Cl) can be converted to phenol (C6H5OH) through a reaction known as the **Dawes process**. This involves treating chlorobenzene with sodium hydroxide (NaOH) under specific conditions (high temperature and pressure).
- **Reaction:**
\[ \text{C}_6\text{H}_5\text{Cl} + \text{NaOH} \xrightarrow{\text{623 K, 300 atm}} \text{C}_6\text{H}_5\text{OH} + \text{NaCl} \]

2. **Identify Reaction Y:**
- Phenol can be converted to salicylaldehyde (C7H6O) through a reaction known as the **Riemann-Tiemann reaction**. This involves the reaction of phenol with chloroform (CHCl3) in the presence of a strong base (NaOH), which generates dichlorocarbene (CCl2) that acts as a nucleophile and replaces a hydrogen atom on the phenol.
- **Reaction:**
\[ \text{C}_6\text{H}_5\text{OH} + \text{CHCl}_3 + \text{NaOH} \rightarrow \text{C}_6\text{H}_4(\text{OH})(\text{CHO}) + \text{NaCl} + \text{H}_2\text{O} \]

### Summary of Reactions:
- **Reaction X:** Dawes process (Chlorobenzene to Phenol)
- **Reaction Y:** Riemann-Tiemann reaction (Phenol to Salicylaldehyde)

### Final Answer:
- Reaction X is the **Dawes process**.
- Reaction Y is the **Riemann-Tiemann reaction**.