how are the vapor pressure and boiling point of alkynes affected as the chain length increases?\nboth vapor…

how are the vapor pressure and boiling point of alkynes affected as the chain length increases?\nboth vapor pressure and boiling point decrease.\nboth vapor pressure and boiling point increase.\nvapor pressure increases, and boiling point decreases.\nvapor pressure decreases, and boiling point increases.

how are the vapor pressure and boiling point of alkynes affected as the chain length increases?\nboth vapor pressure and boiling point decrease.\nboth vapor pressure and boiling point increase.\nvapor pressure increases, and boiling point decreases.\nvapor pressure decreases, and boiling point increases.

Answer

Brief Explanations:

As the chain - length of alkynes increases, the molar mass and surface area increase. This leads to stronger London - dispersion forces between the molecules. Stronger intermolecular forces mean it is harder for molecules to escape into the gas phase (lower vapor pressure) and more energy is required to separate the molecules to reach the boiling point (higher boiling point).

Answer:

D. Vapor pressure decreases, and boiling point increases.