how are the vapor pressure and boiling point of alkynes affected as the chain length increases?\no both…

how are the vapor pressure and boiling point of alkynes affected as the chain length increases?\no both vapor pressure and boiling point decrease.\no both vapor pressure and boiling point increase.\no vapor pressure increases, and boiling point decreases.\no vapor pressure decreases, and boiling point increases.

how are the vapor pressure and boiling point of alkynes affected as the chain length increases?\no both vapor pressure and boiling point decrease.\no both vapor pressure and boiling point increase.\no vapor pressure increases, and boiling point decreases.\no vapor pressure decreases, and boiling point increases.

Answer

Answer:

D. Vapor pressure decreases, and boiling point increases.

Brief Explanations:

As alkyne chain - length increases, intermolecular forces (London - dispersion forces) become stronger. Stronger intermolecular forces mean more energy is needed to vaporize the substance (higher boiling point) and fewer molecules can escape into the gas phase (lower vapor pressure).