The FTSE 100 traded about 0.4% lower on Monday as a sharp pullback in metals prices weighed heavily on mining stocks, dragging the index lower despite gains in defensive names. A broad selloff in commodities hit miners across the board, while oil majors also slipped as crude prices fell. Glencore dropped 3.3% and Rio Tinto fell around 2%, with both stocks under pressure after hopes for a potential mega merger lost momentum as talks were extended to allow more time to agree on valuation. Elsewhere, gold miner Endeavour slid 7.4% and Fresnillo fell 7.6% as precious metals prices retreated. Copper exposed names Antofagasta and Anglo American dropped about 5.4% and 3.5%. The weakness in miners offset strength in defensive sectors, with Unilever up more than 2%, AstraZeneca rising 0.7%, British American Tobacco gaining 0.8%, Relx up 0.9%, Diageo adding 0.8%, National Grid rising 0.7% and Compass Group up 1.5%.