The boiling points of haloalkanes follow the order:

Options

A. `RI gt RBr gt RCI`
B. `RCI gt RBr gt RI`
C. `RI gt RCI gt RBr`
D. `RBr gt Rl gt RCI`

Answer

To determine the boiling points of haloalkanes, we need to consider the factors that influence boiling point, particularly the molecular weight and the strength of intermolecular forces. Here’s a step-by-step solution to the question regarding the boiling points of haloalkanes:

### Step 1: Understand the Factors Affecting Boiling Point
The boiling point of haloalkanes is influenced by:
- Molecular weight
- Intermolecular forces (dipole-dipole interactions, London dispersion forces)

### Step 2: Identify the Haloalkanes
Let's consider the haloalkanes mentioned in the transcript:
- RCl (alkyl chloride)
- RBr (alkyl bromide)
- RI (alkyl iodide)

### Step 3: Compare the Halogens
The boiling points will depend on the mass of the halogen attached to the alkyl group. The order of the halogens in terms of atomic mass is:
- I (iodine) > Br (bromine) > Cl (chlorine)

### Step 4: Determine the Boiling Point Order
Since the boiling point increases with increasing molecular weight (due to stronger London dispersion forces), we can establish the following order based on the halogen:
- RI (alkyl iodide) will have the highest boiling point
- RBr (alkyl bromide) will have a lower boiling point than RI
- RCl (alkyl chloride) will have the lowest boiling point

### Conclusion
Thus, the order of boiling points for the haloalkanes is:
**RI > RBr > RCl**