Multiple choice Which of the following produces reddish brown precipitate? Formic acid and tollen reagent Formic acid and fehling solution 2-pentanone is catalysed by I2+NaOH/NaOI 3-pentanone Only option (3) and (4) Reveal answer Fill a bubble to check yourself B Correct answer Explanation This option is correct because formic acid and Fehling solution react to produce cuprous oxide, which gives reddish brown precipitate.