Hello jagadeesh,

As far as i know companies you mentioned above hire a good no of chemical engineer with maximum vacancies coming from indian oil corporation and ongc, average CTC of iocl and ongc is around  12 lpa for a fresher but it also depends on individual to individual , some can get high packages depending upon colleges , performance etc for a fresher, also it may vary from 35-60k for these companies especially ongc at around 60k , generally Rs.24900.00 as basic pay + DA (current rate around 110%) + cafeteria (max. upto 48.5% of basic pay) + Conveyance allowance (approx. 5k) + Medical charges (as and when required) per month.

Hope this helps