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

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 every alternate letter starting from $B$ of the given alphabet is written in small letters,and the rest are written in capital letters,how will the month of 'September' be written?

If with the third,fourth,fifth,seventh and tenth letters of the word $PERSONALITY$,a meaningful word is formed,then the first letter of the word is the answer. If no word is possible,then $X$ is the answer.

How many pairs of letters are there in the word $ADEQUATELY$ which have as many letters between them in the word as in the alphabet?

Each of the following questions is based on the following alphabet series.
$A, B, C, D, E, F, G, H, I, J, K, L, M$
$N, O, P, Q, R, S, T, U, V, W, X, Y, Z$
Which letter is exactly midway between $H$ and $S$ in the given alphabet?

If it is possible to make a meaningful word with the first,the fourth,the seventh and the eleventh letters of the word $INTERPRETATION$,which of the following will be the third letter of that word? If more than one such word can be made,give $M$ as the answer and if no such word can be made,give $X$ as the answer.