Four of the following five are alike in a certain way and hence form a group. Find the one that doesn’t belong to that group.

Study the following information carefully and answer the questions given below. Ten cosmetic materials viz. Amino, Silicones, Antioxidants, Perfumes, Glycerin, Natural, Clays, Acids, Active and Alkalis are kept in five different shelves of two different stacks viz. Stack 1 and Stack 2, but not necessarily in the same order. The lowermost shelf is numbered as 1 and the topmost shelf is numbered as 5. Stack 1 is to the west of stack 2. Box 2 of stack 1 is immediately above box 1 of stack 1 whereas box 2 of stack 2 is immediately above box 1 of stack 2. More than two shelves are there below Natural which was kept to the east of Silicones.The number of shelves above Silicones is one less than below Alkalis, which was kept in different stack to silicones. Active was kept two shelves above Alkalis the same stack and three shelves above Clays in different stack.Glycerine was kept on the lower-most shelfand to the south of Acids but not in the same stack as Clays. Perfumes was kept immediately above Acids. Antioxidants was neither kept adjacent shelf of Amino nor in the same shelf as Glycerine.