Understanding Alkenes

What is the primary characteristic that distinguishes alkenes from other hydrocarbons?

• They have a single bond between carbon atoms.

• They contain a double bond between carbon atoms.

• They are composed only of hydrogen atoms.

• They have a triple bond between carbon atoms.

How many hydrogen atoms are present in the simplest alkene, ethene?

• Two

• Five

• Three

• Four

What is the molecular formula for ethene?

• C4H8

• C2H4

• C2H2

• C3H6

Which alkene has a molecular formula of C3H6?

• Ethene

• Propene

• Butene

• Pentene

What happens to the boiling point of alkenes as the molecules get longer?

• It remains the same.

• It fluctuates randomly.

• It increases.

• It decreases.