Choose the one which does not belong to the group

According to the Alphabetical coding:

MR11 ⇒ M + R = 13 + 18 = 31\(\div \) 2 = 15.5 ≠ 11

AY13 ⇒ A + Y = 01 + 25 = 26\(\div \) 2 = 13 = 13

KQ14 ⇒ K + Q = 11 + 17 = 28\(\div \) 2 = 14 = 14

GW15 ⇒ G + W = 07 + 23 = 30\(\div \) 2 = 15 = 15

Therefore, option (i) is odd.