Out of benzene, m–dinitrobenzene and toluene which will undergo nitration most easily and why?

Which of the following undergoes nitration most easily?

Nitration is an example of aromatic electrophilic substitution and its rate depends upon the group already present in the benzene ring. Out of benzene and phenol, which one is more easily nitrated and why ?

Indicate the compound which can be nitrated most easily :

Explain, why does benzene not undergo addition reactions easily?

Why styrene undergo anionic polymerisation easily.

Which out of benzene and chlorobenzene undergoes electrophilic substitution easily?

The gas which will be most easily liquefied is

Which of following is most easily cleaved by HBr .