Alcoholic KCN (potassium cyanide dissolved in alcohol) and aqueous KCN (potassium cyanide dissolved in water) exhibit different behaviors in chemical reactions due to the differing solvation properties of the solvents. The nature of the solvent influences the reactivity and selectivity of KCN. Aqueous KCN tends to be more ionizing, while alcoholic KCN may favor different reaction pathways due to the lower polarity of the alcohol.