Note : Consider structures I to VII and answer the questions 23 - 26.
I. `CH_3 - CH_2 - CH_2 - CH_2 - OH`
II. `CH_3 - CH_2 - underset(underset(OH)|) CH - CH_3`
III. `CH_3 - underset(underset(OH)|) overset(overset(CH_3)|)C- CH_3`
IV. `CH_3 - underset(underset(CH_3)|) CH - CH_3 - OH`
V. `CH_3 - CH_2 - O - CH_2 - CH_3`
VI. `CH_3 - O - CH_2 - CH_2 - CH_2 - CH_3`
VII. `CH_3 - O - underset(underset(CH_3)|) CH - CH_3`
Which of the above compounds form pairs of metamers ?

Explanation

To determine which of the given compounds form pairs of metamers, we need to understand the concept of metamerism. Metamers are isomers that differ in the arrangement of carbon atoms on either side of a functional group, typically involving a divalent functional group such as an ether or alcohol.

### Step-by-Step Solution:

1. **Identify the Functional Groups**:
- Look at each compound and identify the functional groups present. In this case, we are particularly interested in the presence of the hydroxyl group (OH) and ether linkages (O).
- Compounds I, II, III, IV contain the hydroxyl group, while compounds V, VI, and VII contain ether linkages.

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