One member of each of the following sets of compounds is not isoelectronic with the others. Which one in each set is the odd one out?
(a) [NO2]+, CO2, [NO2]– and [N3]–
(b) [CN]–, N2, CO, [NO]+ and [O2]2-
(c) [SiF6]2-, [PF6]–, [AIF6]3- and [BrF6]–
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