OCR AS Chemistry F332: Physical Properties of Halogenoalkanes

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Preview of OCR AS Chemistry F332: Physical Properties of Halogenoalkanes

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Physical Properties of Halogenoalkanes
The boiling points of the halogenoalkanes depend on the strength of their intermolecular
As you go down group 7 from fluorine to iodine, the atomic radius of the halogen atoms,
and the number of electron shells that they have, increases.
This increases the instantaneous dipole ­ induced dipole bonds.
This means the forces between the molecules are stronger which means more energy is
needed to overcome them.
The bigger the halogen atom and the more halogen atoms there are, the higher the boiling

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Reactivity of the Halogenoalkanes
Halogenoalkanes contain a polar carbon-halogen bond.
The polarity arises from the different electronegativities of the carbon and halogen atoms.
Halogen atoms are more electronegative than carbon atoms.
The bonded electron pair is attracted more towards the halogen atom than towards the
carbon atom.
The result is a polar bond.
This illustrates the polarity in a molecule of bromomethane
+ -
The electronegativity decreases down the group, resulting in a decrease in polarity of the
carbon-halogen bond from fluorine to iodine.…read more


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