Synthesis of 2‐Aryl Amino‐5‐Aryl/Aryloxy Methyl‐1,3,4‐Oxadiazoles, 2‐Aryl Amino‐5‐Aryl/Aryloxy Methyl‐1,3,4‐Thiadiazoles, N1‐Aryl/Aryloxy Acetyl‐3,5‐DimethylPyrazoles and N1‐Aryl/Aryloxy Acetyl‐3‐Methyl‐5‐Pyrazolones as Possible Fungicides.