A series of wurtzite Zn (1− x ) Cd x S (x=0, 0.25, 0.5, 0.75 and 1) nanocrystals with average crystallite size of 1.98, 1.82, 1.80, 2.04 and 2.51nm, respectively, have been synthesized by simple solvothermal microwave heating method. The photoluminescence yield is found to be higher in the case of alloyed nanocrystals (x=0.25, 0.5, 0.75) as compared to ZnS (x=0) and CdS (x=1). The optical emission is tuned from blue (440nm) to orange (575nm) with the increase of Cd composition in Zn (1− x ) Cd x S nanocrystal. The impedance analysis for Zn (1− x ) Cd x S nanocrystals has been measured as a function of frequency and temperature. The real and imaginary part of complex impedance plots exhibit semicircle behavior in the complex plane. The AC activation energies of ZnS, Zn 0.75 Cd 0.25 S, Zn 0.5 Cd 0.5 S, Zn 0.25 Cd 0.75 S and CdS nanocrystals were calculated from electrical conductivity analysis and are found to be 0.188, 0.378, 0.456, 0.284 and 0.255eV, respectively. The conductivity of the alloyed nanocrystals was higher than that of ZnS and CdS.