The reaction between 1-bromobutane and sodium hydroxide in ethanol is a nucleophilic substitution reaction, specifically an SN2 reaction. In an SN2 reaction, the nucleophile hydroxide ion attacks the substrate 1-bromobutane from the opposite side of the leaving group bromide ion , leading to an inversion of stereochemistry at the reaction center.Here's the step-by-step mechanism for the reaction:1. Sodium hydroxide NaOH dissociates into sodium Na+ and hydroxide OH- ions in the ethanol solvent.2. The hydroxide ion OH- acts as a nucleophile and attacks the electrophilic carbon atom the one bonded to the bromine in 1-bromobutane. This attack occurs from the opposite side of the leaving group bromide ion, Br- .3. The carbon-oxygen bond forms while the carbon-bromine bond breaks simultaneously. The bromide ion Br- leaves as a leaving group, and the nucleophile OH- replaces it.4. The product formed is 1-butanol, and the byproduct is the bromide ion Br- .The major product of this reaction is 1-butanol, as the SN2 mechanism leads to a direct substitution of the bromine atom with the hydroxide ion. There are no minor products in this reaction, as the SN2 mechanism is highly selective and specific for primary alkyl halides like 1-bromobutane.