Two letters in the word $TRESENCE$ have as many letters between them in the word as in the alphabet and in the same order. Which one of the two letters comes earlier in the alphabet?

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

If the first and second letters in the word $DEPRESSION$ were interchanged,also the third and the fourth letters,the fifth and the sixth letters and so on,which of the following would be the seventh letter from the right?

Each of the following questions is based on the following alphabet series.
$A, B, C, D, E, F, G, H, I, J, K, L, M$
$N, O, P, Q, R, S, T, U, V, W, X, Y, Z$
Write the above English alphabet in reverse order. First,cancel every second letter and then select that letter which divides the remaining letters of the alphabet into two equal parts. This letter is:

If it is possible to make only one meaningful word from the first,the third,the fifth,and the eighth letters of the word $ENTERPRISE$ using each letter only once,the first letter of that word is your answer. If more than one such word can be made,your answer is $'X'$. If no such word can be made,your answer is $'Y'$.

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