Arrange the following in the decreasing order of acidity :
(1) `n-`Butanol
(2) sec-Butanol
(3) tert-Butanol

Explanation

To arrange the given alcohols (n-Butanol, sec-Butanol, and tert-Butanol) in decreasing order of acidity, we will analyze the structures and the effects of the alkyl groups on the acidity of the alcohols.

### Step-by-Step Solution:

1. **Identify the Structures of the Alcohols:**
- **n-Butanol (1-butanol):** CH3-CH2-CH2-OH (Primary alcohol)
- **sec-Butanol (2-butanol):** CH3-CH(OH)-CH2-CH3 (Secondary alcohol)
- **tert-Butanol (2-methyl-2-propanol):** (CH3)3COH (Tertiary alcohol)
...