Answer to your question is : Naga Jolokia

The "heat" or "spice" of chilis (chili peppers) is measured in Scoville heat units (SHU), which is the number of times a chili extract must be diluted in water for it to lose its heat.

Bell peppers rank at 0 SHU, New Mexico green chilis at about 1,500 SHU, jalapeños at 3,000–6,000 SHU, and habaneros at 300,000 SHU. The record for the hottest chili pepper was assigned by the Guinness Book of Records to the Naga Jolokia, measuring over 1,000,000 SHU. Pure capsaicin, which is a hydrophobic, colorless, odorless, and crystalline-to-waxy solid at room temperature, measures 16,000,000 SHU.

    Answered by: krishnareddy