The hydrocarbons that will undergo substitution reactions with chlorine would be those that are saturated.
What are saturated hydrocarbons?
They are hydrocarbons that contain no double or triple carbon to carbon bonds.
Such hydrocarbons cannot undergo addition reactions unlike those that contain double or triple bonds.
Alternatively, saturated hydrocarbons are able to undergo substitution reactions with chlorine in the presence of light, with hydrogen being displaced in the process.
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