What is a substitution reaction in the context of alkanes?

A substitution reaction is one in which a hydrogen atom in an alkane is replaced by another atom, such as a halogen.

The reaction of alkanes with halogens requires ______ light as a source of activation energy.

The reaction of alkanes with halogens requires ultraviolet light as a source of activation energy.

Methane + chlorine → chloromethane + hydrogen chloride.

Alkane reactions with halogens are called substitution reactions because a hydrogen atom is replaced by a halogen atom.

False. The reaction is photochemical and requires UV light to provide the activation energy, not a catalyst.

In the substitution of methane with bromine, a hydrogen atom is replaced by a bromine atom, giving bromomethane and hydrogen bromide .

UV light provides the activation energy needed to break the halogen-halogen bond and initiate the photochemical substitution reaction.

Exam code: 5070

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What is a substitution reaction in the context of alkanes?
A substitution reaction is one in which a hydrogen atom in an alkane is replaced by another atom, such as a halogen.
The reaction of alkanes with halogens requires ______ light as a source of activation energy.
The reaction of alkanes with halogens requires ultraviolet light as a source of activation energy.
Write a word equation for the reaction of methane with chlorine in ultraviolet light.
Methane + chlorine → chloromethane + hydrogen chloride.
Alkane reactions with halogens are called ______ reactions because a hydrogen atom is replaced by a ______ atom.
Alkane reactions with halogens are called substitution reactions because a hydrogen atom is replaced by a halogen atom.
True or False?
The reaction between methane and chlorine requires a catalyst but does not need UV light.
False.
The reaction is photochemical and requires UV light to provide the activation energy, not a catalyst.
In the substitution of methane with bromine, a hydrogen atom is replaced by a bromine atom, giving bromomethane and ______.
In the substitution of methane with bromine, a hydrogen atom is replaced by a bromine atom, giving bromomethane and hydrogen bromide.
Why is UV light needed for the substitution reaction between alkanes and halogens?
UV light provides the activation energy needed to break the halogen-halogen bond and initiate the photochemical substitution reaction.

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