Identify the correct statement in the following:

Options

A. Dimethyl ether and ethanol are chain isomers.
B. Ethanoic acid and methyl methanoate are position isomers.
C. n-butane and isobutane are functional isomers.
D. Propan-1-ol and propan-2-ol are position isomers.

Answer

To solve the question, we need to analyze each of the four statements provided and determine which one is correct.

### Step-by-Step Solution:

1. **Statement A: Dimethyl ether and ethanol are chain isomers.**
- **Analysis:**
- Dimethyl ether (CH3OCH3) and ethanol (CH3CH2OH) have different functional groups (ether and alcohol, respectively).
- Chain isomers have the same molecular formula but different arrangements of the carbon skeleton.
- Since dimethyl ether and ethanol have different functional groups, they are not chain isomers but functional isomers.
- **Conclusion:** This statement is **incorrect**.

2. **Statement B: Ethanoic acid and methyl methanoate are position isomers.**
- **Analysis:**
- Ethanoic acid (CH3COOH) and methyl methanoate (HCOOCH3) have different functional groups (carboxylic acid and ester).
- Position isomers have the same carbon skeleton and functional group, but the position of the functional group differs.
- Since these compounds have different functional groups, they cannot be position isomers.
- **Conclusion:** This statement is **incorrect**.

3. **Statement C: N-butane and isobutane are functional isomers.**
- **Analysis:**
- N-butane (CH3CH2CH2CH3) is a straight-chain alkane, while isobutane (CH(CH3)3) is a branched-chain alkane.
- Functional isomers must have different functional groups, but both N-butane and isobutane are alkanes with the same functional group (alkane).
- Therefore, they are chain isomers, not functional isomers.
- **Conclusion:** This statement is **incorrect**.

4. **Statement D: Propane 1-ole and propane 2-ole are position isomers.**
- **Analysis:**
- Propane 1-ole (CH3CH2CH2OH) has the hydroxyl (OH) group on the first carbon, while propane 2-ole (CH3CHOHCH3) has the hydroxyl group on the second carbon.
- Both compounds have the same carbon skeleton and the same functional group (alcohol), but the position of the hydroxyl group differs.
- This fits the definition of position isomers.
- **Conclusion:** This statement is **correct**.

### Final Answer:
The correct statement is **D: Propane 1-ole and propane 2-ole are position isomers.**