MS Chauhan's book is one the best book for organic chemistry and its advance problem .
https://www.google.com/search?q=advanced+problems+in+organic+chemistry+for+jee+by+ms+chauhan+pdf+solution MS Chauhan's book is one the best book
but you need to verify the source and the file authenticity before using it MS Chauhan's book is one the best book
Here is a downloadable pdf link but you need to search on google : MS Chauhan's book is one the best book
https://drive.google.com/file/d/14xAkf7yQWlR6F6MfH_fJ__zVFPH6pdb/view
you can also try