9.Which one of the following structures is not chemically identical to the others? HgC-CH2 CH2-CH3 H2C- -CH CHa CH3-CH2 H2C CH3-CH2-CH-CH3 CH3 HgC-CH2 CH2 H3C-CCH2 D) H3C-CH2 CHs H3C-0 -CH2-CH3 夕 CH2-CH3 HC-CH3 CH3-CH2-CH2 Ans:D Page6
Page 6 9. Which one of the following structures is not chemically identical to the others? A) H3C CH2 H2C CH CH2 CH3 CH3 B) CH3 CH2 H2C CH3 CH2 CH CH3 C) H3C H3C CH2 C CH2 CH2 CH3 H D) H3C H3C CH2 C CH2 CH3 CH3 H E) CH2 CH3 HC CH3 CH2 CH2 CH3 Ans: D
10.Which of the following pairs are not resonance structures of each other? A) H-CEC-H d MC=C=CH B) a and合 11.How many hydrogen atoms are part of the following steroid? OH A)18B)20C)21D)22E)24 Ans:E 2.In the following molecule,how many carbon atoms are in the sphybridization state 〔文 OCH A)2B)4C)5D)6E)11 Ans:D Page7
Page 7 10. Which of the following pairs are not resonance structures of each other? A) H2CCCH H and 2C C CH - - B) O O - - and C) C NH2 O C NH2 O- + and D) C CH2 O C CH2 O - - and E) All are pairs of resonance structures Ans: E 11. How many hydrogen atoms are part of the following steroid? O OH A) 18 B) 20 C) 21 D) 22 E) 24 Ans: E 12. In the following molecule, how many carbon atoms are in the sp 3 hybridization state? OCH3 O A) 2 B) 4 C) 5 D) 6 E) 11 Ans: D