Reactive intermediates are short-lived species that form during chemical reactions. They are not stable enough to exist for long periods and often quickly convert into more stable products. Common types of reactive intermediates include carbocations, carbanions, and free radicals. Their presence is crucial in understanding reaction mechanisms and pathways. These intermediates play a significant role in organic chemistry, influencing the rate and outcome of reactions. For example, a carbocation can act as an electrophile, attracting nucleophiles to form new bonds. Studying reactive intermediates helps chemists design better reactions and synthesize complex molecules efficiently.