Final answer:
The most effective tools for synchronous discussions are Chat, Groups, and Classroom in that order.
Step-by-step explanation:
In the context of synchronous discussions, the most effective tools are Chat, Groups, and Classroom in that order. Chat allows for direct and immediate communication between participants, fostering real-time conversation. Groups provide a more structured and organized environment for collaboration, allowing participants to work together on specific tasks or projects. Classroom offers a centralized platform for sharing resources, assignments, and announcements, but it may not provide the same level of interactivity as the other two options.