page 07 15. The structure of 2-furonitrile is shown. C O C N C H C H C H The number of pi bonds in 2-furonitrile is A 2 B 3 C 4 D 7. 16. The structure of one form of vitamin B3 is shown. OH N O The molecular formula of this structure is A C6H5O2N B C6H6O2N C C7H5O2N D C7H6O2N. 17. Which of the following compounds exhibits geometric isomerism? CH3 CH3 CH3CH2CH2CH CH2 CH3CH CCH3 CH3CH2CH CH3CH2C CH2 CHCH3 A B C D [Turn over page 08 18. The systematic name of the molecule shown above is A cis-2,3-diethylbut-2-ene B trans-2,3-diethylbut-2-ene C cis-3,4-dimethylhex-3-ene D trans-3,4-dimethylhex-3-ene. 19. The structures shown below are isomeric amines. N H3C CH3 CH3 N H3C C2H5 H ethylmethylamine trimethylamine Which line in the table is correct for trimethylamine when compared to ethylmethylamine? Boiling point Solubility in water A higher higher B higher lower C lower higher D lower lower
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