Verbal Reasoning - Mental Ability Questions

In the following question, select the related letter/letters from the given alternatives.

IMO : PTV : : KOQ : ?

In the following question, select the related letter/letters from the given alternatives.

TOK : UQN : : ROL  :  ?

In the following question, select the related letter pair from the given alternatives.

MRQ : PUT : : ?  :  ?

In the following question, select the related number from the given alternatives.

9 : 81 : : 8 : ?

In the following question, select the related word pair from the given alternatives.

Tuesday : Wednesday : : ? : ?

In the following question, select the related number from the given alternatives.

446 : 443 : : 552 : ?

In the following question, select the related letter/letters from the given alternatives.

LJK : IGH : : PST : ?

Which of the following terms follows the trend of the given list?

XXXXXXYY, XXXXXYXY, XXXXYXXY, XXXYXXXY, XXYXXXXY, _______________.