Choose the correct alternative for the missing term in the series: $CE, GI, KM, OQ, ?$

Two terms have been put within brackets. Mark your answer as:
$4, 7, (9), 10, 13, 15, (16), 19$

These questions are based on the following arrangement. Study it carefully and answer the questions.
$8, H, \%, 3, 7, T, A, 4, \#, 6, B, I, @, R, 1, Q, \star, L, E, 2, K, \,U,5,9$
Four of the following five are alike in a certain way on the basis of their positions in the above arrangement and so form a group. Which is the one that does not belong to the group?

Fill in the blank space for the given series with the correct alternative.
$563, 647, 479, 815, (...)$

Fill in the blank space for the given series with the correct alternative.
$2, 5, 9, 19, 37, (\ldots)$

Choose the correct alternative to fill in the blanks in the series: $abca....bcaab....ca....bbc...a$