which is less reactive ethane or benzene ?

Question

And which is more stable also 

Answer 1

This is basically a vague question because it will depend on many variables/conditions.  In some reactions, benzene is more reactive than ethane, whereas in others, the opposite is true.

 

A GENERAL answer would be that benzene is more stable (less reactive) than ethane, and this is based the presence of double bonds and resonance structures found in benzene, and not in ethane.  Double bonds require more energy to break and resonance structure contribute to stability.