... exchangeable by a C3operation that also exchanges the hydrogen atoms below the plane. The top and bottom hydrogens are exchanged by rotation about any of the C2axes that bisect a C᎐C bond and ... the diagonal from upper left to lower right of the transformation matrix is called the trace (in German the spur), and the actual numberis termed the character of the transformation matrix. ... Straight-Chain Alkanes 1145.8 Branched-Chain Alkanes 1155.9 Primary, Secondary, Tertiary, and Quaternary Carbon Atoms 1155.10 Primary, Secondary, and Tertiary Hydrogen Atoms 1165.11 The IUPAC...