What should come in place of (?) in the given letter series? ACE, FGH, ?, PON

In the series of letters given below, which option will come in the place of question mark (?)? BXF, DVI, FTL, HRO, ?

Which letter should replace A, D, G, J, M, ?

The next term of the following letter series will be : CAE, HFJ, MKO, RPT, ….

If the letters of the word “PRODUCT” are arranged alphabetically, then which letter would be last letter of word?

Choose the group of letters which is different from others.