Substitution reaction in Alkane

Subsritution reaction has three strps –

1. Initiation

image

In the reaction shown above, bromine is initiated under UV rays forming Bromine radicals.

2. Propagation

image

There are two steps in propagation;
-Firstly, Ethane reacts with Bromine radical. A single C-H bond is broken by homolytic fission, forming a ethyl radical and HBr.
-Secondly, the ethyl radical reacts with a bromine molecule. The organic product, bromoethane is formed together with a further Bromine radical.

3. Termination

image

In termination stage, two radicals combine together to form a molecule, and there are three possibilities as shown above.

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