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Why is halogenation of an alkane a substitution reaction?

Answer 1

Paisley Boney

Because the halogen takes the place of an #H# atom.

And the word "substitute" means precisely that.

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Answer 2

Carter Allen

Halogenation of an alkane is a substitution reaction because a hydrogen atom in the alkane molecule is replaced by a halogen atom, resulting in the formation of a halogenalkane (alkyl halide) product. This replacement or substitution occurs without altering the carbon skeleton of the alkane molecule.

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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.