Question

what we can observe when benzene is burned in oxygen?

Answer 1

Benzene burns in oxygen to give carbon dioxide and water vapor.

2 C6H6 (l) + 15 O2 (g) ----> 12 CO2 (g) + 6 H2O (g) 

Answer 2

Benzene burns in oxygen to give carbon dioxide and water vapor.
2 C6H6 (l) + 15 O2 (g) ----> 12 CO2 (g) + 6 H2O (g) 
because benzene is carbon compound and when ever any carbon compound is burned it gives  carbon dioxide and water vapor
eg--  CH4+2 O2---->CO2+2 H20