In the present work a series of novel 2,4-disubstituted -1, 5 -diphenyl substituted -1H-imidazole derivatives were screened for anticancer activity using human liver cancer cell line. Derivatives were evaluated for anticancer activities against Hep G2 (Human liver cancer) cell lines. Newly synthesized compounds A-IVn, A-IVo,B-IVb, B-IVc, B-IVd, and B-IVe showed highly significant cytotoxic activity . Compound containing diphenyl substitution with 2-F,3-NO2, 4-Cl, 4-Br,4-OH, 3-Cl , 3-Cl ,2 -NO2 and 2-Cl showed higher anticancer activity against Hep G2 (Human liver cancer) cell lines 5-Flurouracil was used as standard drug for anticancer evaluation.