JEE Advanced 2013 · Paper 2, Chemistry question 21

Ozone. Two equivalent resonance structures make both O-O bonds equal (128 pm); all electrons are paired (diamagnetic); the central O has a lone pair, so the molecule is bent (117°).

Decomposition $\ce{2O3 -> 3O2}$ is exothermic (ozone is the less stable allotrope), so (B) is false.

(A), (C), (D)