The position of how many letters will remain unchanged if each of the letters in the word ‘NOTED’ is arranged in alphabetical outlet?

In the word ‘AMBIDEXTROUS’, if the first letter is interchanged with the last letter, the second letter is interchanged with the eleventh letter, the third letter is interchanged with the tenth letter and so on, then which letter would immediately follow R in the new arrangement when read from left to right?

Each letter in the word EXCITED is arranged in the English alphabetical order. How many letters are there in the English alphabetical order between the letter which is second from the left end and the one which is first from the right end in the new letter-cluster thus formed?

In the word 'REYNOLS' all the letters are replaced by the letter which 4 places before it as per the English alphabetical order. What will be the 5th alphabet in the newly formed word from the right end?

If the letters of the word UNDERSTANDING are arranged in the alphabetical order, then which of the following letters will be in the centre?