(R)-4-bromop ent-1-ene reacts with NaOCH₂CH₃ in ethanol as a solvent. Write two competitive reactions, substitution and elimination, showing: (i) structure of the reactant including stereochemistry, (ii) structure of the products including stereochemistry, and (iii) full mechanism of the reactions (intermediate products if applicable, transition states if applicable resonance structures if necessary), (iv) name the mechanism of each reaction, (v) name product/s of elimination reaction.