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TitleWww.topperlearning.com Userfiles XII Chem Ch10 HaloalkanesAndHaloarenes Concepts(1)
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e. Balz – Schiemann reaction:

4. Physical properties of haloalkanes:

a. Solubility. Although haloalkanes are polar in nature, yet they are

practically very slightly soluble in water. In order for a haloalkane to

dissolve in water, energy is required to overcome the attractions

between the haloalkane molecules and break the hydrogen bonds

between water molecules. However Haloalkanes are not able to form

hydrogen bonds with water and therefore, less energy is released

when new attractions are set up between the haloalkane and the water

molecules because these are not as strong as the original hydrogen

bonds in water molecules. As a result, solubility of haloalkanes in

water is low.

b . Density:

• Simple fluoro and chloroalkanes are lighter than water while

bromides and polychloro devrivatives are heavier than water.

• With the increase in number of carbon atoms, the densities go on

increasing.

• With the increase in number of halogen atoms, the densities go on

increasing.

• The densities increase in the order:

• Fluoride < chloride < bromide < iodide

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