Principal acid found in apples

Select the option that is NOT like the given set.

(8, 40, 56)

Select the option that is related to the third word in the same way as the second word is related to the first word.

Dog : Bark :: Bird : ?

Select the related word/letters/number from the given alternatives.

42 : 14 :: 32 : (?)

Among the given alternatives, three are alike and form a group. Which one does not belong to this group?

Select the option that is related to the fourth word in the same way the second word is related to the first word.

REST : TBUQ:: VALUES:?

Fallacy : Illusion:: Mend:?

Select the option that is related to third word in the same way second word is related to first word.

Vigilant: Watchful :: Fragile: ?

If FROG - PARK = 10, MAID - LITE = 1, then HARM – ROPE=?