Which of the following is not a correct statement for primary aliphatic amines?

Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is :

The nature of oxides V₂O₃ and CrO is indexed as 'X' and 'Y' type respectively. The correct set of X and Y is :

Out of following isomeric forms of uracil, which one is present in RNA?