which of the following reactions of alkanols does not involve c-O bond breadking ?

Options

A. `CH_(3) CH_(2) OH +SOCl_(2)`
B. `CH_(3)CH(OH)CH_(3)+PBr_(3)`
C. `CH_(3)CH_(2)OH+CH_(3)COOH`
D. ROH +HX

Answer

To determine which of the given reactions of alkanols does not involve C-O bond breaking, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Analyze Option A:**
- The reaction involves an alcohol (CS3, CS2, OH) reacting with SOCl2 (thionyl chloride).
- The reaction leads to the formation of an alkyl chloride (CS3, CS2, Cl).
- In this process, the C-O bond in the alcohol is broken to form the new C-Cl bond.
- **Conclusion:** This reaction involves C-O bond breaking.

2. **Analyze Option B:**
- The reaction involves an alcohol (CS3, CH, OH) reacting with PBr3 (phosphorus tribromide).
- The product formed is an alkyl bromide (CS3, CH, Br).
- Similar to option A, the C-O bond in the alcohol is broken to form the new C-Br bond.
- **Conclusion:** This reaction also involves C-O bond breaking.

3. **Analyze Option C:**
- The reaction involves an alcohol (CS3, CS2, OH) reacting with a carboxylic acid (CS3, CO, OH).
- This reaction is known as esterification, which forms an ester (CS3, CO, O, CS2, CS3).
- In this case, the C-O bond in the alcohol does not break; instead, a new bond is formed between the alcohol and the acid.
- **Conclusion:** This reaction does NOT involve C-O bond breaking.

4. **Analyze Option D:**
- The reaction involves an alcohol reacting with HX (hydrogen halide).
- The product formed is an alkyl halide (RX).
- In this reaction, the C-O bond in the alcohol is broken to form the new C-X bond.
- **Conclusion:** This reaction involves C-O bond breaking.

### Final Answer:
The reaction that does not involve C-O bond breaking is **Option C** (esterification).