If in the word $DISTURBANCE$,the first letter is interchanged with the last letter,the second letter is interchanged with the tenth letter,and so on,which letter would come after the letter $T$ in the newly formed word?

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

If each alternate letter beginning with the first in the word $WORKING$ is replaced by the next letter in the English alphabet and each of the remaining letters is replaced by the previous letter in the English alphabet,which of the following will be the fourth from the right end after the replacement?

In the word $FLOURISH$,all the vowels are first arranged alphabetically and then all the consonants are arranged alphabetically. Then,all the vowels are replaced by the previous letter and all the consonants are replaced by the next letter from the English alphabet. Which letter will be third from the right end?

How many pairs of letters are there in the word $NECESSARY$ which have as many letters between them in the word as there are between them in the alphabet and in the same order?

$A$ group of letters is given which are numbered $1, 2, 3, 4, 5$ and $6$. Below are given four alternatives containing combinations of these numbers. Select the combination of numbers so that the letters arranged accordingly form a meaningful word.
$D, I, F, E, R, N$
$1, 2, 3, 4, 5, 6$