Chapter 14: Alkenes

Question 1

What is the general formula for an alkene?

Answer 1

CnH2n+2

Question 2

Do alkenes have double bonds?

Answer 2

Yes

Question 3

How do you name an alkene?

Answer 3

-ene

Question 4

What types of isomer can alkenes form?

Answer 4

Chain, position, geometric/stereoisomerism

Question 5

How do you decide if it is an E or Z isomer?

Answer 5

Z = chains with greatest atomic mass on same side. E = chains with greatest atomic mass on opposite side

Question 6

Are alkenes soluble in water?

Answer 6

No

Question 7

Boiling point trend as carbon chain increases?

Answer 7

Boiling point increases as carbon chain length increases because there are increased VdW forces.

Question 8

What reactions can alkenes undergo?

Answer 8

Combustion, electrophilic addition

Question 9

What is the combustion of alkenes reaction?

Answer 9

Alkene + oxygen –> carbon dioxide + water

Question 10

What is an electrophile?

Answer 10

An electron pair acceptor, attracted to areas of electron density

Question 11

Describe the mechanism for electrophilic addition of alkenes

Answer 11

Electrophile attracted to the double bond. The electrophile accepts a pair of electrons from the double bond. A carbocation is formed. A negatively charged ion forms a bond with the carbocation.