Which one of the following is not the correct order of boiling points of alkyl `//` aryl halides ?

Options

A. `CHCl_3gtCH_2Cl_2`
B. `CH_3(CH_2)_3ClgtCH_3(CH_2)_2Cl`
C. `(CH_3)_3CClgt(CH_3)_2CHCH_2Cl`
D. `CH_3(CH_2)_3ClgtCH_2CH_2CHClCH_3`

Explanation

To determine which of the given options is not the correct order of boiling points of alkyl and aryl halides, we need to analyze the boiling points based on molar mass and surface area. Here's a step-by-step solution:

### Step 1: Understand the Factors Affecting Boiling Points
- **Molar Mass**: Higher molar mass generally leads to higher boiling points.
- **Surface Area**: For compounds with similar molar masses, greater surface area leads to higher boiling points due to increased van der Waals forces.

### Step 2: Analyze Each Option

#### Option A: CHCl₃ vs. CH₂Cl₂
- **CHCl₃ (Chloroform)**: Molar mass = 119.38 g/mol (1 C + 3 Cl)
- **CH₂Cl₂ (Dichloromethane)**: Molar mass = 84.93 g/mol (1 C + 2 Cl)
- **Comparison**: CHCl₃ has a higher molar mass than CH₂Cl₂, hence it has a higher boiling point. This order is correct.

#### Option B: CH₃(CH₂)₃Cl vs. CH₃(CH₂)₂Cl
- **CH₃(CH₂)₃Cl (1-Chlorobutane)**: Molar mass = 92.57 g/mol
- **CH₃(CH₂)₂Cl (1-Chloropropane)**: Molar mass = 76.95 g/mol
- **Comparison**: CH₃(CH₂)₃Cl has a higher molar mass than CH₃(CH₂)₂Cl, hence it has a higher boiling point. This order is correct.

#### Option C: CH₃CCl₃ vs. CH₃CH₂Cl
- **CH₃CCl₃ (Trichloroethane)**: Molar mass = 133.39 g/mol (2 C + 3 Cl)
- **CH₃CH₂Cl (Chloroethane)**: Molar mass = 64.51 g/mol (2 C + 1 Cl)
- **Comparison**: Both have the same number of carbons, but CH₃CCl₃ has more chlorine atoms, leading to a higher boiling point. However, we need to compare their surface areas. CH₃CCl₃ has a more compact structure compared to CH₃CH₂Cl, which has a longer chain. Therefore, CH₃CH₂Cl will have a higher boiling point due to its larger surface area. This order is incorrect.

#### Option D: CH₃(CH₂)₃Cl vs. CH₃(CH₂)₂Cl
- **Analysis**: As previously analyzed in Option B, this order is correct since CH₃(CH₂)₃Cl has a higher molar mass and surface area compared to CH₃(CH₂)₂Cl.

### Conclusion
The incorrect order of boiling points is found in **Option C**.

### Final Answer
**Option C** is not the correct order of boiling points of alkyl and aryl halides.

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