The ad hoc network places a vital role in contemporary day's communication scenario. This network performance gets up while the clustering phenomenon has been incorporated. The cluster formation using the vital parameters is incredible on deciding the efficiency level of the clustered ad hoc networks. The PSO-PAC mechanism forms clusters based on swarm intelligence by considering energy as crucial parameter. This optimized cluster helps to suits the applications where the energy parameter plays a key role. The clusters formed by this mechanism may not ascertain the compactness of the clusters. Thus, this paper proposes D-PAC as an index based validation mechanism to be handled on clusters formed using PSO-PAC. The cluster formation and validation mechanism have been implemented using OMNET++ simulator.