9. How many of the following molecules have all of their atoms in the same plane? H2C = CH2 F2O H2CO NH3 CO2 BeCl2 H2O2 (A)3 (B)4 (C)5 (D)6 (E)7

7. Consider the following octahedral complex structures, each involving ethylenediamine and two different monodentate ligands, X and Y. Which one of the following statements about these structures is incorrect? (A)Structures 1 and 2 are optical isomers. (B)Structures 1 and 3 are optical isomers. (C)Structures 1 and 3 are different complexes. (D)Structures 1 and 4 are geometrical isomers. (E)Structures 3 and 4 are the same complex.

9. How many of the following molecules have all of their atoms in the same plane?

H₂C = CH₂ F₂O H₂CO NH₃ CO₂ BeCl₂ H₂O₂
(A)3
(B)4
(C)5
(D)6
(E)7

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