Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which letter-cluster DOES NOT belong to that group?
(Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)​

Logic: 1st letter - 6 = 2nd letter, 2nd letter - 3 = 3rd letter and 3rd letter - 5 = 4th letter

Now, we check each options.

Option (a): WQNJ (Not Follow)​

W - 6 = Q, Q - 3 = N, N - 5 $$\neq$$​ J

Option (b): KEBW (Follow)

K - 6 = E, E - 3 = B, B - 5 = W

Option (c): QKHC (Follow)​

Q - 6 = K, K - 3 = H, H - 5 = C

Option (d): FZWR (Follow)​

F - 6 = Z, Z - 3 = W, W - 5 = R

Thus, correct option is (a).