WHICH ONE IS THE EFFECTIVE CHEMICAL CARCINOGEN TO INDUCE TUMOR AND CAUSING LETHAL EFFECT?
It depends on what type of tumor you want to induce.
For example, DMBA and TPA can induce skin tumors.
Here is an extensive list of known chemical carcinogens from the McNally Institute. Some of these products are used in research, while others are common in industrial chemistry.
Here is a link to a paper you might find useful on a research study testing the ability of chemicals to cause tumors in animal models.