Which of the following organic groups is misidentified? A) R-OH hydroxyl B) R1OR2 ester C) RNH2 amine D) RSH2 sulfhydryl E) R1 R2 carbonyl F) R1 NR2 amide | H Hints: Fig. 3-11. LibreTexts Section on Organic Redox. Remember that a line represents a bond in the plane of the paper. A dotted wedge represents a bond directed behind the plane whereas represents a bond directed to the front of the plane and H atoms are not drawn. The corner of two lines at an angle represents a C; thus, in the middle of a molecule represents three carbon atoms, i.e., CH2CH2CH2 and would be CH2CH=CH.