inorganic bezene is a compound of B3N3 .
this is called benzen bcz it has benzene like bonding(alternate single & bouble bonds b/w B&N)
,it is planer as the benzene ,
it shows resonance like benzene more over it is a six-membered ring as bezene has.
Bonding between the B (boron )& N(nitrogen ) used to b very strong due to resonance seen as seen in the benzene (which is a organic compound).
Due to so much similarities in B3N3
and benzene ,it called by the name inorganic benzene as benzene is very much popular in organic