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

If it is possible to make only one meaningful word from the second,the fourth,the fifth,the seventh and the eleventh letters of the word $DISTRIBUTION$,the third letter of that word is your answer. If more than one such word can be formed,your answer is $M$,and if no such word can be formed,your answer is $X$.

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

Each of the following questions is based on the following alphabet series.
$A, B, C, D, E, F, G, H, I, J, K, L, M$
$N, O, P, Q, R, S, T, U, V, W, X, Y, Z$
If the above alphabet is written in the reverse order,which will be the eighth letter to the right of $O$?

How many such pairs of letters are there in the word $EXCURSION$,each of which has as many letters between them in the word as they have in the English alphabet?

Which letter will be the fifth from the right if the first and the second,the third and the fourth and so on are interchanged in the word $'COMPANIONATE'?$