Which among the given compounds will give thermal elimination ?

Options

A. `CH_3-CH_2-Br`
B. `CH_3-CH_2-OH`
C. `{:(" "OCOCH_3),(" "|),(CH_3-CH_2-CH-CH_3):}`
D. All of these

Answer

To determine which compound will undergo thermal elimination, we need to analyze the given compounds and their potential to eliminate groups when heated.

### Step-by-Step Solution:

1. **Identify the Compounds**:
We have three compounds to analyze:
- Compound A: CH3-CH2-VR (where VR is a leaving group, likely a halide)
- Compound B: CH3-CH2-OH (an alcohol)
- Compound C: CH3-CH2-CH(OCOCH3)-CH3 (an ether or ester)

2. **Understanding Thermal Elimination**:
Thermal elimination typically involves the removal of a leaving group (like a halide or a good leaving group) to form a double bond (alkene) upon heating.

3. **Analyzing Compound A (CH3-CH2-VR)**:
- This compound has a halide (bromine, for example) which can leave upon heating.
- The elimination would lead to the formation of an alkene.
- However, the stability of the alkene formed and the energy required for elimination also play a role.

4. **Analyzing Compound B (CH3-CH2-OH)**:
- This compound has an -OH group.
- Upon heating, it could potentially eliminate water (H2O) to form an alkene.
- However, the -OH group is not a good leaving group compared to halides, making this elimination less favorable.

5. **Analyzing Compound C (CH3-CH2-CH(OCOCH3)-CH3)**:
- This compound has an OCOCH3 group, which can be a good leaving group.
- Upon heating, the OCOCH3 can easily leave, leading to the formation of a double bond (alkene).
- The elimination here is more favorable due to the stability of the leaving group and the resulting alkene.

6. **Conclusion**:
After analyzing all three compounds, we find that Compound C (CH3-CH2-CH(OCOCH3)-CH3) will undergo thermal elimination most readily due to the presence of a good leaving group (OCOCH3) that can easily depart upon heating.

### Final Answer:
The compound that will give thermal elimination is **Compound C (CH3-CH2-CH(OCOCH3)-CH3)**.