Select the odd out and justify your choice
`Ca(OH)_2, Fe(OH)_3, Cu(OH)_2 ,AI(OH)_3`

Explanation

To solve the problem of selecting the odd one out from the given compounds: Ca(OH)₂ (calcium hydroxide), Fe(OH)₃ (iron(III) hydroxide), Cu(OH)₂ (copper(II) hydroxide), and Al(OH)₃ (aluminum hydroxide), we can follow these steps:

### Step-by-Step Solution

1. **Identify the Compounds:**
- Ca(OH)₂: Calcium hydroxide
- Fe(OH)₃: Iron(III) hydroxide
- Cu(OH)₂: Copper(II) hydroxide
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