Arrange the compounds A to D which have roughly the same molecular weight in order of decreasing boiling points.
(A) `CH_(3)CH_(2)CH(OH) CH_(2)CH_(2)CH_(3)`
(B) `CH_(3)(CH_(2))_(5)CH_(3)`
(C ) `CH_(3)CH_(2)C(OH) (CH_(3))_(2)`
(D) `CH_(3) (CH_(2))_(5)OH`

Explanation

To arrange the compounds A to D in order of decreasing boiling points, we need to analyze the structures of each compound and consider the factors that affect boiling points, such as molecular weight, branching, and hydrogen bonding.

### Step-by-Step Solution:

1. **Identify the Structures:**
- **Compound A:** `CH₃CH₂CH(OH)CH₂CH₂CH₃` (1-hexanol)
- **Compound B:** `CH₃(CH₂)₅CH₃` (hexane)
- **Compound C:** `CH₃CH₂C(OH)(CH₃)₂` (2-propanol)
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