Arrange the following in the increasing order of boiling point:
` C_2 H_ 5 OC_2 H_5 ,C_4 H_9 COOH ,C_4 H_9 OH`

Explanation

To determine the increasing order of boiling points for the compounds \( C_2H_5OC_2H_5 \) (diethyl ether), \( C_4H_9COOH \) (butanoic acid), and \( C_4H_9OH \) (butanol), we need to analyze the types of intermolecular forces present in each compound.

### Step-by-Step Solution:

1. **Identify the Compounds:**
- \( C_2H_5OC_2H_5 \) is diethyl ether.
- \( C_4H_9COOH \) is butanoic acid.
- \( C_4H_9OH \) is butanol.
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