I only have one room with an outlet to charge my devices. I have an extension cord by the couch and another by my bed. Can I plug my MacBook Air into the extension cord to charge it?
If you mean plug the power adapter into an extension cord, yes.
Another option would be to attach the following extension cord to your power adaper: https://www.apple.com/shop/product/MK122LL/A/power-adapter-extension-cable?fnode=8b
You mean use an adapter via an extension cord? There should be no issue since no Apple power adapter draws very much power (easily less than 100 watts). Just check the current/power rating of the extension cord.
Assuming the extension cord is plugged into a working electrical outlet, sure.
can I charge my macbook by plugging it into an extension cord when no outlet is available?
