Conversion of partnership firm into sole proprietorship firm

I with my three friends have started a partnership firm in 2014 we sign up a deed with equal profits share 25% and have gumasta, current bank account and pan card in name of the firm now we want to dissolve it and everyone want to register a sole proprietorship business while I want to use the same name, and bank account in the name of the old firm and they all are agree on this. We also agreed on deviding the assets on mutual understanding. so I have the following question 1. Procedure of Conversion of partnership firm into sole proprietorship . 2. Can I able to use the same bank account and pan card issued in the name of the firm 3. Tax liabilities on the business on this financial year from April 2017 to October 2017 how and when to fill up tax returns 4. Legal liabilities on term 2014 to October 2017 when we are together in partnership 5. Suggest me is that good idea to run the old business or simply dissolve it and I also choose and register new business under sole proprietorship