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Question
Write the names and formula of the products formed when Methane reacts with : (i) Chlorine (ii) bromine. Write the chemical equations.
Solution
(i) When methane reacts with chlorine in the presence of sunlight or UV light, it undergoes substitution reaction to form Tetrachloromethane.
\[\ce{CH4 + Cl2 ->[hv]\underset{\text{Chloromethane}}{CH3Cl} + HCl}\]
\[\ce{CH3Cl + Cl2 ->[hv]\underset{\text{Dichloromethane}}{CH2Cl2} + HCl}\]
\[\ce{CH2Cl2 + Cl2 ->[hv]\underset{\text{Trichloromethane}}{CHCl3} + HCl}\]
\[\ce{CHCl3 + Cl2 ->[hv]\underset{\text{Tetrachloromethane}}{CCl4 }+ HCl}\]
(ii) When it reacts with bromine it forms Tetrabromomethane
CH4 + Br2 → CH3Br + HCl
CH3Br + Br2 → CH2Br2 + HCl
Dibromomethane
CH2Br2 + Br2 → CHBr3 + HCl
Tribromo methane
CHBr3 + Br2 → CBr4 + HCl
Tetrabromomethane
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\phantom{}\ce{H\phantom{...}H\phantom{...}H}\phantom{}\\
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