Which of the following pairs of compounds of carbon will undergo combustion as well as addition reactions?

Options

A. `CH_(4) and C_(2)H_(6)`
B. `C_(2)H_(6)O and C_(3)H_(8)O`
C. `C_(2)H_(4)O_(2) and C_(3)H_(6)O`
D. `C_(2)H_(2) and C_(3)H_(6)`

Explanation

To determine which pairs of carbon compounds will undergo both combustion and addition reactions, we need to analyze the characteristics of combustion and addition reactions.

### Step-by-Step Solution:

1. **Understand Combustion Reaction**:
- Combustion is a reaction where a substance reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O).
- Example: For methane (CH4), the reaction is:
\[ CH_4 + O_2 \rightarrow CO_2 + H_2O \]

2. **Understand Addition Reaction**:
- Addition reactions occur when compounds with double or triple carbon-carbon bonds react with other substances, resulting in a product that has more atoms than the reactants.
- Example: Ethene (C2H4) can undergo an addition reaction with hydrogen (H2) to form ethane (C2H6):
\[ C_2H_4 + H_2 \rightarrow C_2H_6 \]

3. **Analyze the Given Compounds**:
- We need to check each pair of compounds to see if they can undergo both combustion and addition reactions.

4. **Evaluate Each Pair**:
- **Pair 1: CH4 and C2H6**:
- Both can undergo combustion, but neither has a double or triple bond, so they cannot undergo addition reactions.
- **Pair 2: C2H6O**:
- This compound can undergo combustion but does not have a double or triple bond, so no addition reaction.
- **Pair 3: C2H4O2 and CH3CH2CH2OH**:
- Both can undergo combustion, but neither has a C=C or C≡C bond, so they cannot undergo addition reactions.
- **Pair 4: CH≡CH (ethyne) and CH2=CH2 (ethene)**:
- Both can undergo combustion and both have double or triple bonds, allowing them to undergo addition reactions.

5. **Conclusion**:
- The only pair that can undergo both combustion and addition reactions is **Pair 4: CH≡CH (ethyne) and CH2=CH2 (ethene)**.

### Final Answer:
The correct answer is **Pair 4: CH≡CH and CH2=CH2**.