$(2$ points$)$ Explain why gasoline specifications change with geography and season in the US$.$ Be sure to refer to the property$-$function, i$.$e$.$ what product specifications change and why?

$(2$ point$)$ Energy integration is a major goal in many chemical engineering processes, particularly in a crude refining plant. Explain why, for a given distillation column, it is not possible to use the heat removed at the condenser to supply it to the reboiler.