Which functional group is found in an amine? A central carbon is double bonded to O above, and single bonded to R below left and to O single bonded to R below right. N is single bonded to R, and single bonded twice to H. A central carbon is double bonded to O above, and single bonded to R below left and to R prime below right. A central carbon is double bonded to O above, and single bonded to R below left and to H below right.