If an immigrant is married 4yrs & in process of the residency, and the marriage falls apart .am i in jeopardy of loosing my residency to become a citi

Your question is a little confusing. The answer will depend upon whether you are currently a lawful permanent resident or not. Yo must first be a lawful permanent resident to become a U.S. citizen. If your marriage falls apart before you receive lawful permanent residence, you will no longer be eligible for residence through the marriage. You can read more about adjustment of status at http://myattorneyusa.com/adjustment-of-immigration-status.