Why is the halogenation of an alkane a substitution reaction?

Answer 1

Because a halogen atom—which can be any of the following: fluorine, chlorine, bromine, or iodine—replaces one of the hydrogen atoms.

Typical reaction could be: #CH_4+Cl_2->CH_3Cl +HCl#

Where one of the #Cl#-atoms is used to take an #H#-atom away from the molecule, and the other one is taking its place.

This usually requires pressure and heat.

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Answer 2

Santiago Alfonso

The halogenation of an alkane is a substitution reaction because a halogen atom replaces a hydrogen atom in the alkane molecule, resulting in the formation of a halogenated alkane.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.