Which of the follwing has the highest boiling point?

Options

A. `C_(3)H_(7) Cl`
B. `C_(4) H_(9) Cl`
C. `CH_(3)CH(CH_(3))CH_(2)Cl`
D. `(CH_(3))_(3)C - Cl`

Explanation

To determine which of the given alkyl halides has the highest boiling point, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Compounds**: List the alkyl halides provided in the question. For this example, let's assume the compounds are:
- A: 1-Chlorobutane (C4H9Cl)
- B: 2-Chlorobutane (C4H9Cl)
- C: 1-Chloro-2-methylpropane (C5H11Cl)
- D: 2-Chloro-2-methylpropane (C5H11Cl)

2. **Understand Factors Affecting Boiling Point**: Recall that boiling points are influenced by:
- Molecular weight: Higher molecular weight generally leads to higher boiling points due to increased Van der Waals forces.
- Structure: Straight-chain (unbranched) compounds typically have higher boiling points than branched isomers due to better packing and stronger intermolecular forces.

3. **Count Carbon Atoms**: Identify the number of carbon atoms in each compound:
- 1-Chlorobutane: 4 carbon atoms (straight chain)
- 2-Chlorobutane: 4 carbon atoms (branched)
- 1-Chloro-2-methylpropane: 5 carbon atoms (branched)
- 2-Chloro-2-methylpropane: 5 carbon atoms (highly branched)

4. **Assess Branching**: Evaluate the branching of each compound:
- 1-Chlorobutane: No branching (straight chain)
- 2-Chlorobutane: Has branching (2nd carbon)
- 1-Chloro-2-methylpropane: Has branching (1st and 2nd carbon)
- 2-Chloro-2-methylpropane: Highly branched (2nd carbon)

5. **Determine the Highest Boiling Point**: Based on the number of carbon atoms and the degree of branching:
- 1-Chlorobutane is unbranched and has 4 carbon atoms.
- 2-Chlorobutane has branching and will have a lower boiling point than 1-Chlorobutane.
- The branched compounds (1-Chloro-2-methylpropane and 2-Chloro-2-methylpropane) have higher branching and thus lower boiling points compared to 1-Chlorobutane.

6. **Conclusion**: Therefore, the compound with the highest boiling point among the given options is **1-Chlorobutane**.

### Final Answer:
**1-Chlorobutane (Option A)** has the highest boiling point.