The nitrogen oxide(s) that contain(s) N-N bond(s) is (are) -
(A) N2O (B) N2O3
(C) N2O4 (D) N2O5

Joshi sir comment

(A) N2O      (B) N2O3       (C) N2O4   
These 3 contains N-N bond but in    (D) N2O5    There is 1 oxygen atom between 2 NO2 so this does not contain N-N bond

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