Alkenes

Question 1

What is the rotation around a double bond?

Answer 1

• No rotation

Question 2

For a carbon skeleton what does “Cis” and “Trans” refer to?

Answer 2

• Cis: the same side

- Trans: opposite sides

Question 3

What is systematic (Iupac) better for?

Answer 3

• Naming complex structures

- The substituents should be ranked in order of priority on each carbon

Question 4

State the physical properties of the homologous series

Answer 4

• Boiling point increases up the homologous series (van der waals forces)
• Melting point increases up the homologous series

Question 5

True or false: Alkenes have trends similar to alkanes

Answer 5

TRUE

Question 6

What shouldn’t Alkenes be mixed with?

Answer 6

• Water or other polar solvents

Question 7

Alkenes are Less D___ than water

Answer 7

• Dense

Question 8

Pi electrons are further from the ………………… and less firmly bound

Answer 8

• Carbon nuclei

Question 9

Which bonds are stronger , Pi or sigma?

Answer 9

• Sigma bonds, Pi bonds are easily broken

Question 10

What does the loss of H+ and X- ions from adjacent carbons form?

Answer 10

• A new pi bond

Question 11

Reagent - alcoholic sodium (or potassium) H____

Answer 11

• Hydroxide

Question 12

Explain dehydrohalogenation mechanism

Answer 12

• Elimination, Stereospecific

Question 13

Explain dehalogenation of vicinal dibromides ~ what are the two possible reagents

Answer 13

• Nal

- Zn / HOAc (redox reaction)

Question 14

Dehydration of water is the removal of water that requires H___ and A___

Answer 14

• Heat

* Acid