Which letter in the word $SELFRIGHTEOUSNESS$ does not change its position when the letters are reversed?

Select the series in which the letters do not follow a general rule.

Find which one word cannot be made from the letters of the given word.
$CREDENTIAL$

Find which one word cannot be made from the letters of the given word.
$MEASUREMENT$

If the positions of the fifth and twelfth letters of the word $GLORIFICATIONS$ are interchanged; and likewise the position of the fourth and fourteenth letters,the third and tenth letters,the second and eleventh letters and the first and thirteenth letters are interchanged,which of the following will be the twelfth letter from the right end?

Arrange the given words in alphabetical order and choose the one that comes in the middle.