The BSE Sensex plunged by 1,031.65 points (1.35%) on Monday, closing at 76,347.26. The 30-share index fluctuated between a high of 77,128.35 and a low of 76,249.72 during the session. The NSE Nifty50 also ended the day lower, shedding 345.55 points (1.47%) to settle at 23,085.95. The index reached a high of 23,340.95 and a …