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why haptens are not capable of inducing immune response?

Haptens - are small molecules that can be bound to an antibody of T cell receptor. By itself a hapten can not elicit an immune response.
due to its mol.size.

Haptens - are molecules that are not immunogenic but will bind to antibodies. When they are conjugated to a larger, more complex molecule (carrier) they will elicit an immune response. The definition for hapten is base on immunogenicity not necessarily size.

cuz they r too small to elicit immune responce.when they r coupled with a body protein(carrier) they can become immunogenic.

Voicing the same information....Immunogenicity increases with molecular size and complexity. Haptens are generally non-proteins or they are too small to be immunogenic unless they are covalently attached to a carrier protein molecule.