When 1-bromobutane reacts with sodium hydroxide in ethanol solvent, a nucleophilic substitution reaction occurs, specifically an SN2 reaction. In this reaction, the hydroxide ion OH- acts as a nucleophile and attacks the electrophilic carbon atom bonded to the bromine atom in 1-bromobutane. The bromide ion Br- leaves as a leaving group, resulting in the formation of 1-butanol as the product.Reaction:CH3CH2CH2CH2Br + NaOH CH3CH2CH2CH2OH + NaBrProduct: 1-butanolType of nucleophilic substitution reaction: SN2