Give possible explanation for the following : (ii) There are two - `NH_2` groups is semicarbazide . However, only one is involved in formation of semi carbonzone.

Explanation

To explain why only one of the two -NH2 groups in semicarbazide is involved in the formation of semicarbazone, we can break down the reasoning into several steps:

### Step-by-Step Solution:

1. **Structure of Semicarbazide**:
Semicarbazide has the following structure:
\[
\text{NH}_2 - \text{C}(=O) - \text{NH} - \text{NH}_2
...