Which property is characteristic of alkenes, alkynes, and aromatic hydrocarbons?
a. their vapor pressures decrease as their size increases.
b. their ph values are greater than 7.
c. their densities are lower than the density of water.
d. they are soluble in water.

The best and most correct answer among the choices provided by your question is the third choice or letter C.

"Their densities are lower than the density of water." is a common property among alkenes, alkynes, and aromatic hydrocarbons.

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Particle exchange energy though elastic collision , hope this .