The boiling points of hydrides of group 16 are in the order

Options

A. `H_2O gt H_2Te gt H_2S gt H_2Se`
B. `H_2O gt H_2S gt H_2Se gt H_2Te`
C. `H_2O gt H_2Te gt H_2Se gt H_2S`
D. `H_2O gt H_2Se gt H_2S gt H_2O`.

Explanation

To determine the boiling points of the hydrides of group 16 elements (the oxygen family), we need to analyze the trends based on molecular weight and intermolecular forces.

### Step-by-Step Solution:

1. **Identify the Hydrides of Group 16**:
The hydrides of group 16 elements include:
- H2O (water)
- H2S (hydrogen sulfide)
- H2Se (hydrogen selenide)
- H2Te (hydrogen telluride)
- H2Po (hydrogen polonide, though it is less commonly discussed due to its radioactivity)

2. **Understand the Factors Affecting Boiling Points**:
- The boiling point of a substance is influenced by its molecular weight and the type of intermolecular forces present.
- Generally, as molecular weight increases, the boiling point increases due to stronger van der Waals forces.

3. **Consider Hydrogen Bonding**:
- Water (H2O) has a significantly higher boiling point than expected due to hydrogen bonding, which is a strong intermolecular force. This bonding occurs between the hydrogen atoms and the oxygen atom, leading to a higher boiling point.

4. **Analyze the Boiling Points**:
- H2O has the highest boiling point due to hydrogen bonding.
- H2Te, H2Se, and H2S will have their boiling points determined primarily by their molecular weights and van der Waals forces.
- The order of boiling points based on increasing molecular weight is generally:
- H2S < H2Se < H2Te

5. **Final Order of Boiling Points**:
- Therefore, the boiling points of the hydrides of group 16 can be summarized as:
- H2O > H2Te > H2Se > H2S

### Conclusion:
The correct order of boiling points of the hydrides of group 16 is:
**H2O > H2Te > H2Se > H2S**