Doubly example sentences

In one of the isomers, the bromine atoms are attached to the doubly bonded carbon atoms whereas in the other, they are attached to the singly bonded carbons.This illustrates that the restricted rotation of atoms or groups around the doubly bonded carbon atoms gives rise to different geometries of such compounds.Doubly bonded carbon atoms have to satisfy the remaining two valences by joining with two atoms or groups.Similarly, it is more difficult to remove a proton from a doubly charged HPO4 2– anion as compared to H2PO4 –.