Supply structures for H through K. Given :
`" An aldohexose" overset(NH_(2)OH"/base")(to)H overset(Ac_(2)O"/"NaOAc)(to)I overset(-HOAC)(to)J overset(NaOMe"/"MeOH)(to)K`.
Explain the last step.
What is net structural change.
Name this overall method.
Discuss the possibility of epimer formation.

Explanation

To solve the question step by step, we will analyze the transformations of an aldohexose through the specified reactions and provide the necessary structures and explanations.

### Step 1: Identify the Aldohexose
The starting compound is an aldohexose. A common example is glucose, which has the following structure:

**H**:
```
CHO
...