Hey Rahul
You might be eligible for Bridging open work permit (Certain federal economic class applicants)
You can apply for an open work permit if you:
-Have applied for permanent residence (PR) in Canada under one of the admissible categories of the economic class and are the principal applicant,
-Have received a positive eligibility assessment on your PR application or, if applicable, the Acknowledgment of Receipt from the processing office,
-Are currently in Canada, and
-Already have a valid work permit that is due to expire within 4 months.
Check these links:
http://www.cic.gc.ca/english/resources/tools/temp/work/prov/bridging.asp
Application form: http://www.cic.gc.ca/english/information/applications/extend-worker.asp
I hope that helps.
Cheers