Number of letters skipped in between adjacent letters in the series increases by one. Which of the following series observes the rule given above?

Arrange the given words in alphabetical order and choose the one that comes in the second place:

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?

How many independent words can $HEARTLESS$ be divided into without changing the order of the letters and using each letter only once?

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 even letter beginning from $B$ is replaced by an odd number beginning with $3$,which letter/number will be the third to the right of the tenth number/letter counting from your right?

If it is possible to make only one meaningful English word with the third,the seventh,the eighth and the tenth letters of the word $PREDICAMENT$,which of the following will be the third letter of that word? If no such word can be made,give $X$ as the answer and if more than one such word can be made,give $Y$ as the answer.