Which one of the following compounds will be most readily dehydrated?

Options

A.
B.
C.
D.

Explanation

To determine which compound will be most readily dehydrated, we need to analyze the stability of the carbocation that will form during the dehydration process. The stability of carbocations is influenced by the inductive effect (I effect) and resonance effect (if applicable).

Let's break down the steps:

### Step 1: Identify the Compounds
We have four compounds to consider. Let's denote them as:
1. Compound A: \( \text{CS}_3\text{C(OH)}\text{CH}_2\text{CH}_2\text{CH}_3 \)
2. Compound B: \( \text{CS}_3\text{C(OH)}\text{CH}_2\text{CH}_3 \)
3. Compound C: \( \text{CS}_3\text{C(OH)}\text{CH}_3 \)
4. Compound D: \( \text{CS}_3\text{C(OH)} \)

### Step 2: Analyze Each Compound for Carbocation Stability
- **Compound A**: When dehydrated, it forms a carbocation where the hydroxyl group (OH) is replaced by a hydrogen atom. The adjacent carbon has a -I effect due to the presence of the -OH group, which destabilizes the carbocation.

- **Compound B**: Similar to Compound A, the -OH group will also destabilize the carbocation due to its -I effect, making dehydration less favorable.

- **Compound C**: The carbocation formed here has the -OH group further away, which means the -I effect is less pronounced. This makes the carbocation more stable compared to Compounds A and B.

- **Compound D**: The carbocation formed here is very unstable due to the direct -I effect of the -OH group, making dehydration very unfavorable.

### Step 3: Compare Carbocation Stability
From the analysis:
- Compound A and B have significant destabilization due to the -I effect of the -OH group.
- Compound C has a more stable carbocation due to the -OH group being further away, leading to less destabilization.
- Compound D has the least stability due to the direct influence of the -OH group.

### Step 4: Conclusion
Based on the stability of the carbocations formed, **Compound C** will be the most readily dehydrated because it leads to the formation of the most stable carbocation.

### Final Answer
The compound that will be most readily dehydrated is **Compound C**.

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