27.(a) 0o::0:一0：0：0：i:6 Major Major @智 Major(b) (e) 27. (a) In some of these answers, additional, less favorable forms are shown for comparison purposes. (b) (c) (d) (e) Identical. (f) (g) H H H H C N O
(Positive oxygen) (Carbon sextet) Major H H H H C N
O H H H H C N
O O Cl O O Cl O
O Cl O Major Major H H H H H C