logical reasoning alphabet series

What will come in place of the question mark(?) in the following alphabet series based on their positions in the English alphabet? DGH JMN ?VYZ

What will come in place of the question mark(?) in the following alphabet series ? TG HU VI JW ?

What will come in place of the question mark(?) in the following alphabet series ? Ac dc ef ig ?

What will come in place of the question mark(?) in the following alphabet series ? WE SG PJ LN ?

What will come in place of the question mark(?) in the following alphabet series ? KN NL QJ TH ?

If each consonant in the word EXPLORATION is replaced by the previous alphabet and each vowel is replaced by the alphabet given it in the English alphabetic series, and then the order of the alphabets thus formed is reversed, which of the given will be the seventh from the right? 1) P 2) Q 3) B 4) K 5) None of these