Explain the mechanism of chlorination of Methane for 3 marks
Answers
Answer:
The chain mechanism is as follows, using the chlorination of methane as a typical example: 1. Initiation: Splitting or homolysis of a chlorine molecule to form two chlorine atoms, initiated by ultraviolet radiation or sunlight. A chlorine atom has an unpaired electron and acts as a free radical.
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Answer:
Mechanism of chlorination of methane
Free radical substitution
CH4 + Cl2----> CH3Cl + HCl
Mechanism
step 1:- chain initiation reaction
homolysis of chlorine molecule to form chlorine free radicals
Cl-Cl ----> Cl• + Cl•
chlorine free radicals
Step 2:- chain propagation reaction
1) CH4 + Cl• ----> CH3• + HCl
Methyl free radicals
2) CH3• + Cl-Cl ---->CH3-Cl + Cl•
chlorine free radical
step 1 and step 2 repeats several times till the reaction is towards completions.
Step 3:- Chain termination
Cl• + Cl• ------> Cl2
CH3• + Cl• ----->. CH3-Cl
CH3• + CH3• ------> C2H6.
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