¹H nuclear magnetic resonance (NMR) spectra and birefringence of noncubic plastic single crystals (CH₃)₂CCl ₂-CCl₄ have been measured. The investigation has demonstrated that in these crystals weak preferred orientations of molecules were observed. Concentration dependence of orientational ordering matrix of (CH₃)₂CCl₂ molecules has been obtained from computer simulations of NMR line shape and birefringence data. It has been found that all ordering matrix elements become zero at mole fraction of 2,2-dichloropropane 0.5.