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An efficient and facile method for the synthesis of substituted imidazoles (10a-10g) has been reported by reacting substituted aldehydes (1–7), benzil (8) and ammonium acetate [9] in presence of reuseable solid acid catalyst viz. Rice Husk Ash.SO3H (RHA.SO3H) at room temperature. The homogeneity of compounds was confirmed by melting point and thin layer chromatography. All synthesized compounds (10a-10g) were characterized by 1H NMR and FTIR spectral techniques. The prepared catalyst has been characterized by SEM, TEM and X-ray diffraction methods. All synthesized compounds were further tested for in vitro herbicidal activity against Raphanus sativus L. seeds. The compounds were also screened for their antifungal activity against Rhizoctonia solani and Aspergillus niger by poisoned food technique method. From bio evaluation data, it was found that compounds 10c and 10a were most active against Raphanus sativus L. seeds. Compound 10g was found most active against R. solani fungus at highest concentration. Compound 10f has shown maximum percentage growth inhibition i.e. 71.89 against A. niger at 200 ​μg/mL concentration.