Given below are the structures of few compounds with molecular formula `C_(4)H_(10)O`. Select metamers from these structures.
(i) `CH_(3)-O-CH_(2)CH_(2)CH_(3)`
(ii) `CH_(3)CH_(2)CH_(2)CH_(2)OH`
(iii) `CH_(3)-CH_(2)-O-CH_(2)-CH_(3)`
(iv) `CH_(3)-underset(OH)underset(|)(C)H-CH_(2)-CH_(3)`

Options

A. (i) and (ii)
B. (ii) and (iii)
C. (i) and (iii)
D. (ii) and (iv)

Explanation

To determine the metamers among the given compounds with the molecular formula C₄H₁₀O, we first need to understand what metamers are. Metamers are compounds that have the same molecular formula but differ in the arrangement of atoms around a functional group, typically due to the presence of a bivalent atom like oxygen or sulfur.

Now, let’s analyze the given compounds:

1. **Compound (i)**: `CH₃-O-CH₂CH₂CH₃` (This is an ether)
2. **Compound (ii)**: `CH₃CH₂CH₂CH₂OH` (This is an alcohol)
3. **Compound (iii)**: `CH₃-CH₂-O-CH₂-CH₃` (This is an ether)
4. **Compound (iv)**: `CH₃-CH(OH)-CH₂-CH₃` (This is an alcohol)

### Step-by-Step Solution:

1. **Identify the Functional Groups**:
- Compound (i) is an ether.
- Compound (ii) is an alcohol.
- Compound (iii) is an ether.
- Compound (iv) is an alcohol.

2. **Check for Metamers**:
- Metamers must have the same functional group and differ only in the position of the bivalent atom (in this case, oxygen).
- **Comparing Compounds**:
- **(i) and (iii)**: Both are ethers, and they differ in the arrangement of carbon chains around the oxygen. Therefore, they are metamers.
- **(i) and (ii)**: Different functional groups (ether vs alcohol), so they are not metamers.
- **(i) and (iv)**: Different functional groups (ether vs alcohol), so they are not metamers.
- **(ii) and (iii)**: Different functional groups (alcohol vs ether), so they are not metamers.
- **(ii) and (iv)**: Both are alcohols, but they have different structures, so they are not metamers.
- **(iii) and (iv)**: Different functional groups (ether vs alcohol), so they are not metamers.

3. **Conclusion**:
- The only pair of metamers among the given compounds is **(i) and (iii)**.

### Final Answer:
The metamers from the given structures are **(i) and (iii)**.