Out of the four letter-clusters listed, three are alike in some manner and one is different. Select the odd one.

Based on the English alphabetical order, three of the following four letter groups are alike in a certain way and form a group. Which letter group does not belong to that group?
(Note: The odd letter group is not based on the number or position of vowels/consonants.)

Based on the alphabetical order, three of the following four are alike in a certain way and thus form a group. Which is the one that 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)

Based on the English alphabetical order, three of the following four letter-cluster pairs are alike in a certain way and thus form a group. Which letter-cluster pair 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.)

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.)

Based on the English alphabetical order, three of the following four letter cluster pairs are alike in a certain way and thus form a group. Which is the one that does not belong to that group?

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.)

Based on the English alphabetical order, three of the following four letter-cluster pairs are alike in a certain way and thus form a group. Which letter-cluster pair 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.)

Four pairs of letter-clusters have been given out of which three are alike in some manner and one is different. Select the one that is different.

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?

Three of the four groups of number-letters are alike. Which does not belong to the group?