<prompt> All are true about Vitamin C except:-It is water soluble vitaminMost sensitive to heatPotent antioxidantReduces ferrous iron to ferric iron  <response>: Vitamin C Ascorbic acid: Water soluble vitamin. Potent antioxidant. Required for formation of collagen. Reduces ferric iron to ferrous iron thus increasing iron absorption. The most sensitive of all vitamins to heat. Deficiency Scurvy - swollen and bleeding gums, SC bruising, bleeding into the skin and joints, delayed wound healing, anaemia and weakness. 