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i got the same question on my chem hw and im d y i n g 

Answer : The given equation represents "Substitution reaction" of alkanes

Explanation :

The given reaction is,

[tex] CH_{4}+ Br_{2}\rightarrow CH_{3}Br + HBr [/tex]

To find out the type of reaction, we need to look at the reactants and products involved in the reaction

CH₄ is an alkane known as methane and Br₂ is bromine which belongs to halogen family.

During the reaction , we can see that one of the H atoms of methane is substituted by Br to form a product CH₃Br.

Therefore this is a "substitution reaction of alkanes" Since a hydrogen atom gets replaced by a halogen atom, it is also termed as "halogenation of alkanes"