Among the hydrides of group 15 elements which has highest boiling point?

Explanation

To determine which hydride of the group 15 elements has the highest boiling point, we can follow these steps:

### Step 1: Identify the Group 15 Elements
Group 15 elements include nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). Their corresponding hydrides are:
- NH₃ (ammonia)
- PH₃ (phosphine)
- AsH₃ (arsine)
- SbH₃ (stibine)
...