Four number groups are given, out of which three are same in a certain way. Find the odd group that does not belong to the group?

(2, 3, 5)

6 → 6 × \(\frac{3}{2}\) = 9    (6)² – 1 = 35 ,

8 → 8 × \(\frac{3}{2}\) = 12  (8)² – 1  = 63 ,

10 → 10 × \(\frac{3}{2}\) = 15    (10)² – 1  = 99 ,

But in option (4) it is not following the above pattern,

2 → 2 × \(\frac{3}{2}\) = 3    (2)² – 1 = 3