1-28 HHHH H HH (a) H- C-H and H-C- C-H t different-making models will help H H you visualize these structures. H (b) H-C -6-H and H-C-6- -C-H These are the only two possibilities. HHH HH H These are the only two possibilities. H-C-C-N:and H-C- -N -C-H but your structures ma appear HHH different- ing models will help HH H (d)H-6-c-C-N: H- c-0-c-N:H-c-C-0-N: HHH Think of all the eaded tothe in().Thereare many more HHH HH:O:H H-C=C-0-H H-c-c-H These are the only three structures with this molecular HH 1-29 HH H H一9 -0-9 H一 structures 。H HOCH2CH2CH3 CHCH2OCH CHCH(OH)CH 15 Copyright013 Pearson Education,Inc