Synthesis and Antimicrobial Screening of (1-(2,4-Dichlorophenyl)-1H-Pyrazol-4yl (2-Hydroxyphenyl) Methanone and 2- (1-2,4-Dichlorophenyl)- 1H-Pyrazol-4yl) Benzo [D] Oxazole

3-Formylchromone 1 was treated with 2, 4-dichlorophenylhydrazine hydrochloride to get (1-(2,4-dichlorophenyl)-1H-pyrazol-4yl (2-hydroxyphenyl) methanone 2. Compound 2 on treatment with hydroxylamine hydrochloride gave the compound (1-(2,4-dichlorophenyl)-1H-pyrazol-4yl (2-hydroxyphenyl) oxime 3. Compound 3 on treatment with POCl3 gave 2- (1-2,4-dichlorophenyl)-1H-pyrazol-4yl) benzo [d] oxazole 4. The structures of compounds have been established on the basis of spectral data. These compounds were screened for their antimicrobial activities.