Mobile Ad Hoc Networks (MANETs) are a collection of network nodes that work independently. MANETs are used in diverse applications like conferences, e-classrooms, military applications etc. Since the devices in MANETs act as host as well as router and are also used in critical applications, it becomes necessary that they are supported by efficient routing protocols. Efficient routing protocols also result in good Quality of Service (QoS) parameters. In this paper, two popular reactive routing protocols: Ad hoc On Demand Distance Vector (AODV) protocol and Dynamic Source Routing (DSR) protocol are analyzed for less and high density of nodes in MANETs. Their QoS parameters are evaluated and obtained results are analyzed as well as co. Simulation is done in MATLAB.