Question

What is the valency of selenium in five membered ring system?
DrBob222
More than likely it will be 4 or 6 but there is no way of knowing without knowing the system.
vinod
Thank you Sir, but if it is five membered ring system having 1-Se, 2-N, 3-C=O, 4-CH2, 5-CH2 then what will be the valency of Se in this type of ring system?