reactions of alkenes

this is a list of the reactions and the results of reactions of alkenes.

HideShow resource information

alkenes have a high electron density at the C=C bonds.

1 of 14

And so they can be attacked by substances we call electrophites (electron deficit species) some substances are added to the carbon atoms with the double bond.

2 of 14

hydrogenation/addition of hydrogen

3 of 14

alkenes react with hydrogen in the presence of a nickel catalyst at about 152 degrees to form alkanes e.g

this type of reaction is useful in converting unsaturated oils into margarine.

(http://upload.wikimedia.org/wikipedia/en/c/c4/Hydrogenation.gif)

4 of 14

with steam

5 of 14

they react with steam in the presence of phosphoric acid (catalyst) to form alcohols.

ethene reacts to form ethanol:

(http://scienceaid.co.uk/chemistry/organic/images/etheneethanol.jpg)

6 of 14

with hydrogen halide

7 of 14

react with hydrogen halide to form a halogenoalkane the reactivity decreases with the bond strength of the hydrogen halide.

Ethene reacts with hydrogen chloride chloroethane:

(http://www.chemguide.co.uk/mechanisms/eladd/ethhclmech.GIF)

8 of 14

with halogens

9 of 14

they react very fast with halogens to form (di)halogeno alkane. the reaction between bromine and alkenes is used as a test for unsaturation. And also potassium promanganate.

(http://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Bromine-adds-to-ethene.png/300px-Bromine-adds-to-ethene.png)

10 of 14

with dilute manganate 7

11 of 14

alkenes are quickly oxidised by dilute manganate 7 to form diol (contains OH) in this reaction the OH group is added to the carbons which had the C=C.

12 of 14

self addition polymerisation

13 of 14

in the presence of a catalyst, right temperature and pressure they undergo polymerisation to form polyalkenes.

some compounds containing C=C may also undergo polymerisation to form polymers.

14 of 14

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Reactions resources »