Synthesis of some 3-(5-chloro-1,3-diaryl-1 H -pyrazol-4-yl)-1-arylprop-2-en-1-ones and 1,5-bis(5-chloro-1,3-diaryl-1 H -pyrazol-4-yl)pent-1,4-diene-3-ones and their antimicrobial activity