Much of the communication between insects involves chemical messengers called pheromones....

Much of the communication between insects involves chemical messengers called pheromones. A species of cockroach secretes a substance from its mandibular glands that alerts other cockroaches to its presence and causes them to congregate. One of the principal components of this aggregation pheromone is the alkane shown. Give the molecular formula of this substance, and represent it by a condensed formula.