Organic nitrates in photochemical smog may lead to difficulty in breathing. The diagram displays one example of an organic nitrate molecule. In which order should the bond angles shown be arranged in ascending order (smallest first)?
- A$1 \rightarrow 2 \rightarrow 3$
- B$2 \rightarrow 1 \rightarrow 3$
- C$3 \rightarrow 1 \rightarrow 2$
- D$3 \rightarrow 2 \rightarrow 1$