The correct order of increasing boiling points is

Options

A. bromomethane ` lt `bromoform `lt ` chloromethane `lt `dibromomethan
B. bromoform `lt ` dibromomethane `lt ` chloroform `lt ` chloromethane
C. chloroform `lt ` bromoform` lt ` Chloromethane` lt ` dibromomethane
D. chloromethane `lt ` bromomethane ,`lt` dibromomethane `lt ` bromoform

Explanation

To determine the correct order of increasing boiling points among the given haloalkanes and haloarenes, we need to consider the factors that affect boiling points, primarily the molecular mass and surface area of the compounds.

### Step-by-Step Solution:

1. **Identify the Compounds**:
Let's assume the compounds given are:
- A: Chloromethane (CH3Cl)
- B: Bromomethane (CH3Br)
- C: Dibromomethane (CH2Br2)
- D: Bromoform (CHBr3)

2. **Calculate the Molecular Masses**:
- Chloromethane (CH3Cl):
- C: 12 g/mol
- H: 3 × 1 g/mol = 3 g/mol
- Cl: 35.5 g/mol
- Total = 12 + 3 + 35.5 = **50.5 g/mol**

- Bromomethane (CH3Br):
- C: 12 g/mol
- H: 3 × 1 g/mol = 3 g/mol
- Br: 79.9 g/mol
- Total = 12 + 3 + 79.9 = **94.9 g/mol**

- Dibromomethane (CH2Br2):
- C: 12 g/mol
- H: 2 × 1 g/mol = 2 g/mol
- Br: 2 × 79.9 g/mol = 159.8 g/mol
- Total = 12 + 2 + 159.8 = **173.8 g/mol**

- Bromoform (CHBr3):
- C: 12 g/mol
- H: 1 × 1 g/mol = 1 g/mol
- Br: 3 × 79.9 g/mol = 239.7 g/mol
- Total = 12 + 1 + 239.7 = **252.7 g/mol**

3. **Analyze the Boiling Points**:
- The boiling points of these compounds generally increase with increasing molecular mass due to stronger Van der Waals forces.
- Based on the calculated molecular masses:
- Chloromethane (50.5 g/mol) will have the lowest boiling point.
- Bromomethane (94.9 g/mol) will have a higher boiling point than Chloromethane.
- Dibromomethane (173.8 g/mol) will have a higher boiling point than Bromomethane.
- Bromoform (252.7 g/mol) will have the highest boiling point.

4. **Order of Increasing Boiling Points**:
- Therefore, the order of increasing boiling points is:
- Chloromethane < Bromomethane < Dibromomethane < Bromoform

### Final Answer:
The correct order of increasing boiling points is:
**Chloromethane < Bromomethane < Dibromomethane < Bromoform**