Oil & gas, auto and FMCG shares saw selling while buying was seen buying in IT, consumer durables and healthcare.
After shedding 281 points last week, the Sensex fell further by 56.06 points, or 0.27 per cent to end at 20,659.52.
The 30-share index, which was today dragged lower by losses in RIL, HDFC Bank and Sun Pharma shares, has now lost 667 points in five straight sessions to end at its lowest level since November 28 when it had ended at 20,534.91.
Costly vegetables, particularly potato and onion, pushed the November wholesale inflation to a 14-month high of 7.52 per cent. Last week, government data showed November retail inflation spiked to above 11 per cent.
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"Market participants are widely expecting a 25-bps point repo-rate hike on December 18 policy, taking the repo rates to April 2012 levels... There are (also) a lot of speculations with regard to the overseas meeting that will decide the fate of the QE status," said Vishal Jajoo, Senior Research Analyst (PCG), Nirmal Bang Securities.
Infosys surged to an almost 3-year high and Wipro also touched multi-year highs. Sesa Sterlite soared 4.5 per cent.
In the broader market, 1,105 scrips advanced, 1327 fell and 180 closed unchanged. GSK Pharma shares jumped nearly 19 per cent after open offer from UK-based parent. Spicejet jumped 8 per cent after air connectivity pact with Tigerair.
"The market may remain in a volatile mode till the outcome of the RBI and the U.S. Fed policy meeting on December 18," said Delhi-based broker Rajiv Malik of RNM Securities.