3 Alkenes - Introduction

Question 1

What is the trend relationship between alkenes and alkanes of similar C chain legnth boiling point?

Answer 1

Alkenes and alkanes of same legnth C chain have a similar boiling point.

Question 2

Why do alkenes have slightly lower boiling points than alkenes of the same carbon chain legnth?

Answer 2

alkenes have a slightly lower bp due to weaker VDW forces as they contain 2 less electrons meaning there is a weaker attraction between molecules, making them easier to break, therefore lower bp.

Question 3

Are alkenes soluble?

Answer 3

• not soluble in water as they are non-polar
• soluble in other organic solvents

Question 4

Are alkenes reactive?

Answer 4

Their only IMF is VDW, they are very reactive due to C=C bond.