Unit – ID

Isomerism in Haloalkanes

  • Isomers are the organic compounds, which have the same molecular formula but different structural formula and properties. The phenomenon is called isomerism.
  • Haloalkanes can exhibit following type of isomerism.

a) Chain Isomerism:

  • The haloalkanes with four or more carbon atoms exhibit this type of isomerism. This isomerism is exhibited due to difference in the carbon chains.



b) Position Isomerism:

  • The haloalkanes with three or more carbon atoms exhibit this type of isomerism. This isomerism is exhibited due to difference in the position of halogen group.

c) Optical Isomerism:

  • The haloalkanes which have the same molecular and structural formula, but have a different arrangement of the atoms or group of atoms in space and have tendency to rotate plane of polarised light are called optical isomers and the phenomenon is called optical isomerism. (This isomerism is discussed in detail in Unit – X|)

Examples:

Isomers of monochloro drivatives of 2,3-Dimethylbutane: 

Structure of 2,3-Dimethylbutane is

.                                                       
The isomers of monochloro derivatives of 2,3-Dimethylbutane are




Isomers of C5H11Br and their classification:

Note: 2-Bromo-2-methylbutane, 2 – Bromo-3-methylbutane, 1 – Bromo-3-methylbutane are enantiomers. i.e. they are optically active compounds

Isomers of C4H9Br and their classification:

Isomerism in Haloalkanes

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