Which one will replace the question mark?

In a certain code language, PINK is written as GREEN, GREEN is written as YELLOW, YELLOW is written as RED, RED is written as WHITE and WHITE is written as INDIGO, then in the same code language what is the colour of BLOOD?

A is shorter than F who is shorter than three persons, C is shorter than D, who is tallest. B is taller than E. C is neither shorter than F nor taller than A. Who among the following is the second youngest person?

In the following series find the missing numbers.
5, 13, 40, 104,?

B : 16 : D : ?

The diagram below represents the students who study Physics, Chemistry and Mathematics. Study the diagram and identify the region which represents students who study both Physics and Chemistry but not Mathematics?

In the following question, select the related number from the given alternatives.
50: 65 :: 122 :?

X, Q, K, F, ?