How many pairs of letters in the word $CHAIRS$ have as many letters between them in the word as in the alphabet?

If the first and second letters in the word $MISFORTUNE$ were interchanged,also the third and the fourth letters,the fifth and the sixth letters and so on,which letter would then be the eighth letter counting to your left?

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

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 first and the second letters interchange their positions,and similarly the third and the fourth letters,the fifth and the sixth letters,and so on,which letter will be the seventeenth from your right?

If all the letters in the word $PRINCE$ are rearranged in alphabetical order,then how many letter$(s)$ will remain unchanged?

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