Mumbai, June 12 -- Oil & Natural Gas Corpn Ltd gained for a fifth straight session today. The stock is quoting at Rs 249.1, up 0.72% on the day as on 12:44 IST on the NSE. The benchmark NIFTY is down around 0.33% on the day, quoting at 25057.2. The Sensex is at 82216.93, down 0.36%. Oil & Natural Gas Corpn Ltd has gained around 3.29% in last one month. Meanwhile, Nifty Energy index of which Oil & Natural Gas Corpn Ltd is a constituent, has gained around 5.11% in last one month and is currently quoting at 36624.7, down 0.85% on the day. The volume in the stock stood at 232.3 lakh shares today, compared to the daily average of 99.55 lakh shares in last one month. The benchmark June futures contract for the stock is quoting at Rs 249.97, up ...