Intermolecular Forces

Step 1: Understand the factors affecting boiling point
The boiling point of a compound is determined by the strength of intermolecular forces: - Stronger intermolecular forces lead to higher boiling points.

Step 2: Compare the compounds
- (water) has hydrogen bonding, which is a strong intermolecular force, leading to a high boiling point.
- (methane) has weak London dispersion forces, leading to a very low boiling point.
- (ammonia) has hydrogen bonding, but it is not as strong as in .
- (carbon dioxide) is a nonpolar molecule with weak dispersion forces, leading to a low boiling point.
Step 3: Conclusion
Since water has the strongest hydrogen bonding, it will have the highest boiling point among the given options.
Answer: Therefore, the compound with the highest boiling point is . So, the correct answer is option (1).