Urgent Transfer Function Problem

Not sure we understand your question. Please clarify.

It would be easier if you just posted your homework question verbatim - then we could all chorus "we don't do homework!", but at least we'd know what you were talking about, and someone kind may give you a push in the right direction.

No chance with such bad infos.....

You get a GA for both deconstructing the gobbledygook way the question was phrased and for making a clear concise answer that the apparent two pole low pass filter must be stable. The Spice like verbal circuit description technique will give us a better idea what his circuit actually contains. But this is a time that a picture is worth a thousand words. Many people here have easily posted pencil on paper scanned images here before. The one thing omitted from your answer though is that for instability to happen, a pole must reside in the right hand plane, but it need not be imaginary.

You simultaneously get a "Tsk Tsk" finger wag from me for solving this blatant homework problem.

i need the value of the Resistances & capacitors which make the RC circuit unstable

Choose values for your op-amp feedback circuit that will cause positive feedback and an unstable circuit. Additionally look up second-order circuit layouts on the internet for more information.

I think that answers your question.