Hello everyone. Nitro group present on benzene ring is a meta directing group. We can prove it by drawing its resonating structures. In the similar way you can try resonating structures of Benzaldehyde, Benzoic Acid, acetophenone, Benzoic(cyanobenzene) etc.
Feel free to ask anything. You can post your queries in comments segment.
![](https://i.ytimg.com/vi/oZRMzzZRSrc/maxresdefault.jpg)