Impedance of individual component in complex AC circuit
i want to find the impedance of components C2, C3, L2 and L3 in the circuit below.


These 4 elements can't be combined to find an equivalent impedance because of the presence of R2.

If you want to find the equivalent impedance of all 5 elements, including R2, you will just do the same math you would if they were all resistors, but use their complex impedance values instead of real-valued resistances. 

This particular subcircuit can't be solved using just parallel and series combinations, so you'll need to either use more complex combinations like the wye-delta transform or just use KVL or KCL to form equations and solve the circuit.