April 9 (Reuters) - Canada’s main stock index fell on Friday, weighed down by weak metal and oil prices, but was set to record a fifth consecutive week of gain on optimism around a faster economic recovery. At 9:31 a.m. ET (13:31 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was down 51.67 points, or 0.27%, at 19,177.2. (Reporting by Shashank Nayar in Bengaluru; Editing by Shinjini Ganguli)