– Lime is the only one without ‘a’.

– Grape is the only one starting with two consonants.

– 6 is the only even number.

– 3 is the only one that divides its surrounding numbers.

– 15 is the only one representable as the product of two different numbers in the list.

– 9 is the only square number.

– 5 is the only one not divisible by 3.

– In the first ordering, 15 is the only one greater than the preceding number.

– In the second ordering, 3 is the only one lower than the preceding number.