17.Which of the follo H.CH.CH.CH.CI CHCH-CH(CH3)CI AnsC 18.How would the following molecule be properly named? CH3 CH3-CH CH3CH2-CH HC-CH2CH2CH3 CH2 CHa 3-ethyl-2-methyl-4- D)3-isopropyl-4-propylhexane B) opyiepne 3.4-diethyl-2-methylheptane E)none of the above 19. p) 24.4-trimethylheptane 3-tert-butyl-2.2-dimethylbutane none of the above C) 2.2,3,4,4-pentamethylpentane Ans:C 20.What is the smalles C)pentane E)all are liquids 21.All steroids are derivatives of the ring system shown.How many tertiary hydrogens are in this ring system? 〔 EeB剧24D)5目6 Page7 Page 7 17. Which of the following contains the sec-butyl group? A) (CH3)2CHCH2Cl D) CH3CH2CH2CH2Cl B) (CH3)3CCl E) None of the above C) CH3CH2CH(CH3)Cl Ans: C 18. How would the following molecule be properly named? CH3 CH CH CH3 HC CH2 CH3 CH3CH2 CH2CH2CH3 A) 3-ethyl-2-methyl-4-propylhexane D) 3-isopropyl-4-propylhexane B) 3,4-diethyl-2-methylheptane E) none of the above C) 4-ethyl-3-isopropylheptane Ans: B 19. The IUPAC name for [(CH3)3C]2CHCH3 is: A) 1,1-di-tert-butylethane D) 2,4,4-trimethylheptane B) 3-tert-butyl-2,2-dimethylbutane E) none of the above C) 2,2,3,4,4-pentamethylpentane Ans: C 20. What is the smallest alkane that is liquid at room temperature? A) propane B) butane C) pentane D) hexane E) all are liquids Ans: C 21. All steroids are derivatives of the ring system shown. How many tertiary hydrogens are in this ring system? A) none B) 2 C) 4 D) 5 E) 6 Ans: E