The compound CH3CH2OH is ethanol. The functional group present in this compound is the hydroxyl group -OH , which makes it an alcohol.When ethanol reacts with bromine water Br2/H2O , it undergoes a substitution reaction, specifically a halogenation reaction. In this reaction, the bromine atom replaces the hydrogen atom of the hydroxyl group, forming ethyl bromide CH3CH2Br and water H2O as products.The balanced chemical equation for this reaction is:CH3CH2OH + Br2 CH3CH2Br + H2O