The alkene formed as a major product in the elimination reaction of a quaternary ammonium hydroxide (Hofmann elimination) is:[Image showing N-ethyl-N,N-dimethylbutan-1-aminium hydroxide heated]

Hofmann Elimination follows the rule that the least substituted alkene is formed as the major product (Hofmann product).This is due to steric hindrance in the transition state and the acidity of hydrogens.In this substrate, we can form:Ethylene (from the ethyl group).1-butene (from the butyl group).Ethylene is less substituted than 1-butene, so ethylene is the major product.