Equity benchmark Sensex plummeted 1,170 points on Monday, dragged by losses in Reliance Industries, Bajaj Finance and Kotak Bank. The 30-share BSE index ended 1,170.12 points or 1.96 per cent lower at 58,465.89. Similarly, the NSE Nifty fell 348.25 points or 1.96 per cent to 17,416.55.