Question

Which statement is NOT a property of unsaturated hydrocarbons?

Unsaturated hydrocarbons are very reactive.
Unsaturated hydrocarbons require energy to react.
Unsaturated hydrocarbons contain double and triple bonds.
Unsaturated hydrocarbons undergo addition reactions to become saturated.

Answer 1

Unsaturated hydrocarbons require energy to react.

Step-by-step explanation:

Unsaturated hydrocarbons react very rapidly with halogens. The unsaturated compound can be changed to a saturated compound. No energy is needed for this reaction, as the double or triple bonds are very unstable.

Answer 2

I would pick "Unsaturated hydrocarbons are very reactive." This is because while unsaturated hydrocarbons are indeed more reactive than their saturated counterparts, they still do require some energy, called activation energy, to be overcome before the reactions occur.