teach me basic concept of chemistry of class 11th class at iit level questions ???

dear friend it is difficult to teach here at one go .but the basic concepts in chemistry comprises of following chapter :-
(1)mole concept,equivalent concept
(2)atomic structure
(3)periodic table
(4)chemical bonding
(5)organic-IUPAC nomenclature,mechanism,isomerism

these topic can be easily found in our website wher you can clearly understand
it is explanied in detail and in alucid manner