Alkenes

Question 1

Alkenes are a homologous series of unsaturated hydrocarbons, which have:

The same functional group - at least one carbon-carbon ……….. bond / C=C
The same general formula - …………
Similar chemical properties
Differ in their chemical formula by one -……….- group
Have gradually changing ……………..properties

Answer 1

double

CnH2n

CH2

physical

Question 2

Alkynes contain at least one

Answer 2

carbon-carbon triple bond

Question 3

alkene shape

Answer 3

trigonal planar (bond angle = 120 o).

Question 4

Where do alkenes come from?

Answer 4

Cracking of long-chain hydrocarbons

Chemical reactions such as the elimination reaction of a halogenoalkane to form an alkene.

Question 5

Names of first 5 alkene

Answer 5

ethene
propene
butane
pentene
hexene