Please refer to the following link for courses offered by the department of Organic Chemistry in the current (Oct 2020) semester. It is an intra-IISc webpage where you can access the links to the lectures along with other important information.
https://indianinstituteofscience.sharepoint.com/sites/OC
Details of courses from other departments can be found at: https://indianinstituteofscience.sharepoint.com/sites/Academics/Pages/Departments.aspx