The compound with highest boiling point is

Options

A. Ethylene bromide
B. Ethylene chloride
C. Ethylidene bromide
D. Ethylidene chloride

Answer

To determine which compound has the highest boiling point among the given options, we can follow these steps:

### Step 1: Understand the Factors Affecting Boiling Point
Boiling point is influenced by several factors:
- **Molecular Weight**: Generally, higher molecular weight leads to a higher boiling point.
- **Surface Area**: Larger surface area can increase boiling point due to greater Van der Waals forces.
- **Intermolecular Forces**: Stronger intermolecular forces (like hydrogen bonding, dipole-dipole interactions) can also raise boiling points.

### Step 2: Analyze the Given Compounds
We have four compounds to consider:
1. **Ethylene Bromide (1,2-Dibromoethane)**: CH2Br-CH2Br
2. **Ethylene Chloride (1,2-Dichloroethane)**: CH2Cl-CH2Cl
3. **Ethylidene Bromide (1,1-Dibromoethane)**: CH3-CHBr2
4. **Ethylidene Chloride (1,1-Dichloroethane)**: CH3-CHCl2

### Step 3: Compare Molecular Weights
- Bromine (Br) has a higher atomic weight than chlorine (Cl). Therefore, compounds containing bromine are expected to have higher boiling points than those containing chlorine.
- We can eliminate options 2 (Ethylene Chloride) and 4 (Ethylidene Chloride) based on this factor.

### Step 4: Compare the Remaining Compounds
Now we are left with:
1. **Ethylene Bromide (1,2-Dibromoethane)**
2. **Ethylidene Bromide (1,1-Dibromoethane)**

### Step 5: Analyze Surface Area
- **Ethylene Bromide** has a straight-chain structure, which generally provides a larger surface area compared to branched structures.
- **Ethylidene Bromide** has a branched structure, which typically results in a smaller surface area.

### Step 6: Conclusion
Since Ethylene Bromide has a higher molecular weight and a larger surface area compared to Ethylidene Bromide, it will have the highest boiling point among the compounds listed.

### Final Answer
**Ethylene Bromide (1,2-Dibromoethane) has the highest boiling point.**

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