Alkenes

Question 1

Hydrogenation

Answer 1

React w hydrogen gas + PASSED over nickel catalyst at 150 C , ALKANE produced

Question 2

E isomer

Answer 2

Same groups across double bond

Question 3

Z isomer

Answer 3

Same groups both above /below double bond

Question 4

Cis/trans isomerism

Answer 4

Special case of E/Z
Carbon atoms have one group in common
Cis - same groups on same side (Z)
Trans - same groups on opposite sides (E)
Can only be used when each carbon atom in double bond is attached to a single hydrogen atom

Question 5

When do E/Z isomers occur

Answer 5

When each carbon atom of double bond is attached to diff groups

Question 6

Stereoisomers

Answer 6

Same structural formula but different arrangement in space

Question 7

Why Alkenes more reactive

Answer 7

Pi bond has low bond enthalpy, weaker than sigma bond
Electron density of bond spread out above + below plane of sigma bond
Pi bond STICKS out, Pi electrons are on outside, more exposed electrophiles likely to attack

Question 8

Compound with two double bonds

Answer 8

DIENE

Question 9

Compounds with two carboxykuc acid FG

Answer 9

DIOC

Question 10

Useful ways to use polymers

Answer 10

Recycled to make other plastic materials
Combustion to generate electricity
As organic feedstock