Which of the following alkane upon dichlorination can give only two products ?

Options

A. `CH_(3)-CH_(2)-CH_(3)`
B. `CH_(4)`
C. `C(CH_(3))_(4)`
D.

Answer

To solve the question of which alkane upon dichlorination can give only two products, we will analyze each option step by step.

### Step 1: Understanding Dichlorination
Dichlorination involves the substitution of hydrogen atoms in an alkane with chlorine atoms. When two chlorine atoms are added, they can be substituted on the same carbon or on different carbons.

### Step 2: Analyzing Each Option

#### Option A: Propane (C3H8)
- Structure: CH3-CH2-CH3
- Possible products:
1. Cl on the first carbon and Cl on the second carbon: CH3-CHCl-CHCl
2. Cl on the second carbon: CH3-CCl2-CH3
3. Cl on the first and third carbon: CH2Cl-CH2-CH2Cl
4. Cl on the first carbon: CHCl2-CH2-CH3

- Total products: 4 products
- Conclusion: Not the correct answer.

#### Option B: Methane (CH4)
- Structure: CH4
- Possible product:
- When dichlorination occurs, both H atoms are replaced by Cl: CH2Cl2

- Total products: 1 product
- Conclusion: Not the correct answer.

#### Option C: Ethane (C2H6)
- Structure: CH3-CH3
- Possible products:
1. Cl on the first carbon and Cl on the second carbon: CH3-CHCl2
2. Cl on the first carbon: CH2Cl-CH2Cl

- Total products: 2 products
- Conclusion: This is the correct answer.

#### Option D: Cyclohexane (C6H12)
- Structure: Cyclohexane
- Possible products:
1. Cl on the first carbon and Cl on the second carbon
2. Cl on the first and third carbon
3. Cl on the first and fourth carbon
4. Cl on the first carbon only

- Total products: 4 products
- Conclusion: Not the correct answer.

### Final Answer
The alkane that upon dichlorination can give only two products is **Option C: Ethane (C2H6)**.

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