(I) Give various functional isomers of butan-1-amine and give their isomeric relations.
(II) Give various isomers of butan -1-amine and their isomeric relations.

Explanation

To solve the question regarding the functional isomers and isomers of butan-1-amine, we will break it down into two parts as specified in the question.

### Part I: Functional Isomers of Butan-1-amine

1. **Identify the Structure of Butan-1-amine**:
- The molecular formula of butan-1-amine is C4H11N.
- The structure can be represented as:
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