10-Alkenes

Question 1

The stability of an alkene (increases/decreases) as the number of $ groups on the C=C (increases/decreases)

Answer 1

increases-increases

Question 2

alkenes have (high/low) melting points

Answer 2

low

Question 3

melting points and boiling points (increases/decreases) as the number of carbons (increases/decreases)

Answer 3

increase-increase

b/c of increased surface area

Question 4

alkenes are (soluble/insoluble) in organic solvents

Answer 4

soluble

Question 5

alkenes are (soluble/insoluble) in water

Answer 5

insoluble

Question 6

When both X and Y are added from the SAME side

Answer 6

syn addition

Question 7

When X and Y are added from opposite sides

Answer 7

anti addition

Question 8

Electrophilic Addition of HX to Alkenes:

mechanism?

Answer 8

• two steps
• rate-determining step forms a carbocation
• rearrangements can occur

Question 9

Electrophilic Addition of HX to Alkenes:

regioselectivity

Answer 9

in unsymmetrical akenes, H bonds to the less substituted C to form the more stable carbocation

Question 10

Electrophilic Addition of HX to Alkenes:

stereochemistry

Answer 10

sny and anti addition occur