JEE Main levelOne or more correct optionsDifficulty 2 of 3cb044
In which of the following species does each bond from the central atom to a terminal O atom have an average bond order of 1.5?
A\ce{O3}
B\ce{NO2-}
C\ce{CO3^2-}
D\ce{NO3-}
Answer: A, B
OX3 and NOX2X− each have two equivalent structures with one double and one single bond, so the average is (2+1)/2=1.5. COX3X2− and NOX3X− have three structures, so the average is 4/3.