Arrange group 15 hydrides in increasing order of their boiling points.

Explanation

To arrange the Group 15 hydrides in increasing order of their boiling points, we need to consider the molecular structure and the intermolecular forces present in each hydride. The Group 15 hydrides are NH3 (ammonia), PH3 (phosphine), AsH3 (arsine), SbH3 (stibine), and BiH3 (bismuthine).

### Step-by-step Solution:

1. **Identify the Group 15 Hydrides**:
- The hydrides of Group 15 are NH3, PH3, AsH3, SbH3, and BiH3.

2. **Consider Molecular Weight**:
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