Select odd one out which does not fit as required and justify your answer
K, Zn, Cu, AI `" "` Reaction with water

Explanation

To solve the question of selecting the odd one out among K (Potassium), Zn (Zinc), Cu (Copper), and Al (Aluminium) based on their reactions with water, we can analyze each element's behavior when exposed to water.

### Step-by-Step Solution:

1. **Identify the Reaction of Each Element with Water:**
- **Potassium (K):** Potassium reacts vigorously with water to form potassium hydroxide (KOH) and hydrogen gas (H₂).
\[
2K + 2H_2O \rightarrow 2KOH + H_2 \uparrow
...