Logical Sequence of Words Questions

If the letters in the word BACKFIELDS are arranged as in the English alphabetical order, then which letter will be to the second right of the letter 'F', after the rearrangement?

From the given alternatives, select the word which CANNOT be formed using the letters of the given word.

Responsibility

A series is given, with one word missing. Choose the correct alternative from the given ones that will complete the series.

Laugh, Alter, Melts, Realm, Muesli, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
? , Microgram, Milligram, Gram

In the word ACCUMUATES, if the 1st letter is interchanged with 2nd, 3rd with 4th, 5th with 6th, 7th with 8th and 9th with the 10th, then the 6th letter from the left will be

In the following question, from the given alternative words, select the word which cannot be formed using the letters of the given word.
Superconductors

From the given alternative words, select the word which cannot be formed using the letters of the given word:

ENDEAVOUR

From the given alternative words, select the word which cannot be formed using the letters of the given word:

ANNOUNCEMENTS