Question

During a reaction, the –OH group of an alcohol is replaced by a chlorine atom. Which type of reaction occurred?
addition
condensation
elimination
substitution

Answer 1

This is a substitution reaction (SN1 or SN2, if using organic chemistry terminology). The OH and Cl are two types of functional groups (hydroxyl group and halogen, respectively), so because one type of functional group is being replaced with another, this is a substitution reaction. 

Answer 2

In a chemical reaction, the replacement of the alcohol group by a chlorine atom is called a substitution reaction. Thus, option D is accurate.

What are substitution reactions?

When the functional group is replaced by another functional group then the reaction is called a substitution reaction. In this case -OH (hydroxyl) and -Cl (halogen) are two functional groups. When they replace each other then they are said to undergo substitution.

In addition reaction, a functional group is added to the reactant, in the elimination reaction reactants get split and in the condensation reaction, two molecules of the reactant combine.

Therefore, option D. the replacement of the hydroxyl group by the chlorine atom is a substitution reaction.

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