you can also try
but you need to verify the source and the file authenticity before using it you can also try but you need to
https://www.google.com/search?q=advanced+problems+in+organic+chemistry+for+jee+by+ms+chauhan+pdf+solution you can also try but you need to
MS Chauhan's book is one the best book for organic chemistry and its advance problem . you can also try but you need to