In each of the following questions, a sequence of numbers or letters that follow a definite pattern is given. Each question has a blank space. This has to be filled by the conect answer from the four given options to complete the sequence without breaking the pattern.
5 : 626 :: 6 : __________
AEF : BIJ :: __________ : OUV
$$2^23^3 : 12 :: 3^45^2 : .............$$
$$60^\circ : \sqrt{3} :: ........... : 1$$
Pick up the odd thing out in the following options and mark its number as your answer for the question: