O LEVEL
ORGANIC CHEMISTRY: ALKENES
MOOSA BH KHAN
0345-2494359
,Syllabus
11.2 Alkenes
(a) describe the alkenes as a homologous series of unsaturated hydrocarbons with the general
formula CnH2n and containing the C=C functional group
(b) draw the structures of branched and unbranched alkenes, C2 to C4, and name the unbranched
alkenes, ethene to butane.
(c) describe the manufacture of alkenes and hydrogen by cracking hydrocarbons and recognize that
cracking is essential to match the demand for fractions containing smaller molecules from the
fractional distillation of petroleum (crude oil)
(d) describe the difference between saturated and unsaturated hydrocarbons in terms of their
structures
and in their reaction with aqueous bromine
(e) describe the properties of alkenes in terms of combustion, polymerization and their addition
reactions with bromine, steam and hydrogen
(f) state the meaning of polyunsaturated when applied to food products
(g) describe the manufacture of margarine by the addition of hydrogen to unsaturated vegetable
oils to
form a solid product
PREPARED BY MOOSA BH KHAN - 03452494359.
, ALKENES
- Have general formula CnH2n
- all alkene names end with –ene.
- The formula of one alkene differs from the next by –CH2.
- have similar properties like alkane going down the series
Example: propene has three carbon atom, thus n=3. Then the formula of
propane is C3H6
- Ends with suffix –ene
- Next alkene formula differs by –CH2 atoms. Eg ethene: C2H4, Propene: C3H6
First alkene is ethene: C2H4
Structure of Alkenes/Displayed formula:
Shows how all atoms in a molecule joined together by drawing lines between
atoms to represent the bonds
Structure of Alkenes
In organic compound containing C = C double bond, said to be unsaturated
Reason: not all C atoms are bonded to the maximum no. of 4 other atoms
Example:
PREPARED BY MOOSA BH KHAN - 03452494359.
ORGANIC CHEMISTRY: ALKENES
MOOSA BH KHAN
0345-2494359
,Syllabus
11.2 Alkenes
(a) describe the alkenes as a homologous series of unsaturated hydrocarbons with the general
formula CnH2n and containing the C=C functional group
(b) draw the structures of branched and unbranched alkenes, C2 to C4, and name the unbranched
alkenes, ethene to butane.
(c) describe the manufacture of alkenes and hydrogen by cracking hydrocarbons and recognize that
cracking is essential to match the demand for fractions containing smaller molecules from the
fractional distillation of petroleum (crude oil)
(d) describe the difference between saturated and unsaturated hydrocarbons in terms of their
structures
and in their reaction with aqueous bromine
(e) describe the properties of alkenes in terms of combustion, polymerization and their addition
reactions with bromine, steam and hydrogen
(f) state the meaning of polyunsaturated when applied to food products
(g) describe the manufacture of margarine by the addition of hydrogen to unsaturated vegetable
oils to
form a solid product
PREPARED BY MOOSA BH KHAN - 03452494359.
, ALKENES
- Have general formula CnH2n
- all alkene names end with –ene.
- The formula of one alkene differs from the next by –CH2.
- have similar properties like alkane going down the series
Example: propene has three carbon atom, thus n=3. Then the formula of
propane is C3H6
- Ends with suffix –ene
- Next alkene formula differs by –CH2 atoms. Eg ethene: C2H4, Propene: C3H6
First alkene is ethene: C2H4
Structure of Alkenes/Displayed formula:
Shows how all atoms in a molecule joined together by drawing lines between
atoms to represent the bonds
Structure of Alkenes
In organic compound containing C = C double bond, said to be unsaturated
Reason: not all C atoms are bonded to the maximum no. of 4 other atoms
Example:
PREPARED BY MOOSA BH KHAN - 03452494359.
