A pair of compounds, which has odd electrons in the group of $\mathrm{NO},\mathrm{CO},{\mathrm{ClO}}_2,{\mathrm{N}}_2{\mathrm{O}}_5,{\mathrm{SO}}_2\text{ and }{\mathrm{O}}_3$ are

Total no. of electrons in

• $\mathrm{NO}=7+8=15$
• ${\mathrm{ClO}}_2=17+2\times 8=33$
• $\mathrm{CO}=6+8=14$
• ${\mathrm{SO}}_2=16+2\times 8=32$
• ${\mathrm{O}}_3=8\times 3=24$
• Only NO and ClO₂ have odd electrons .