Question

Which is a property of both alkenes and alkynes?

Both are highly water soluble.

The pH of these hydrocarbons tends to be very basic.

Their boiling points tend to increase with chain length.

Their densities are all much higher than that of water.

Answer 1

Their boiling points tend to increase with chain length.

Answer 2

Answer: Option (c) is the correct answer.

Explanation:

An alkene molecule has a double bond whereas an alkyne molecule has a triple bond.

Properties of alkenes and alkynes are as follows.

• Both are insoluble in water.
• Their pH is less than 7.
• Boiling point increases with increase in carbon atoms or chain length.
• Their densities are less than the density of water.

Thus, we can conclude that out of the given options, their boiling points tend to increase with chain length is a property of both alkenes and alkynes.