Sample Questions - Chapter 27

Organic Chemistry -Formulas, Names & PropertiesExamples ofMultiple Choice Questions

1.What makes carbon such a unique element? (a) Elemental carbon comes in two forms, diamond and graphite. (b) Carbon forms four bonds, although the ground state configuration would predict the formation of fewer bonds. (c) Carbon forms covalent bonds rather than ionic bonds. (d) To a greater extent than any other element, carbon can bond to itself to form straight chains, branched chains and rings. (e) Carbon has two stable isotopes, carbon-12 and carbon-13. 2.The hybridization of carbon atoms in alkanes is (a) sp (b) sp2 (c) sp3 (d) sp3d (e) sp3d2 3.A molecule with the formula C3H8 is a(n): (a) hexane (b) propane (c) decane (d) butane (e) ethane 4.Select the correct IUPAC name for: (a) 5-methyl-5-ethyloctane (b) 5-methyl-5-propylheptane (c) 4-ethyl-4-methyloctane (d) 3-methyl-3-propyloctane (e) 3-methyl-3-propylheptane 5.Select the correct IUPAC name for: (a) 1,1,3-trimethylpentane (b) 1-ethyl-1,3-dimethylbutane (c) 2,4-dimethylhexane (d) 3,5-dimethylhexane (e) 3,5,5-trimethylpentane 6.Select the correct IUPAC name for: (a) 1,4-dimethylcyclopentane (b) 1,3-dimethylcyclopentane (c) 2,5-dimethylcyclopentane (d) 2,3-dimethylcyclopentane (e) 2,4-dimethylcyclopentane 7.The general formula for noncyclic alkenes is: (a) CnH2n+2 (b) CnH2n (c) CnH2n-2 (d) CnHn+2 (e) CnHn 8.The correct name for the compound given below is: (a) 2-methyl-1-butene (b) 2-ethyl-1-propene (c) 2-ethyl-1-pentane (d) 3-methyl-2-butene (e) pentene 9.Select the best name for: (a) 4-ethyl-cis-3-octene (b) 4-ethyl-trans-3-octene (c) 4-butyl-cis-3-hexene (d) 5-ethyl-trans-5-octene (e) 5-ethyl-cis-5-octene 10.Name the following compound: (a) 6-ethyl-4-methylcyclohexene (b) 6-ethyl-3-methylcyclohexene (c) 3-ethyl-5-methylcyclohexene (d) 6-ethyl-4-methylcyclohex-1-ene (e) 6,4-dialkylcyclohexene 11.What is the IUPAC name of the following compound? (a) 2,6-diethyl-3-nonyne (b) 2,5-diethyl-3-nonyne (c) 3,7-dimethyl-5-nonyne (d) 3,7-dimethyl-4-nonyne (e) 2,6-diethyl-3-heptyne 12.The following chemical structure represents a molecule of what molecular formula? (a) C8H10 (b) C6H6 (c) C6H8 (d) C8H12 (e) C8H6 13.How many actual double bonds does the benzene ring possess? (a) None, carbon-carbon bonds in benzene are delocalized around the ring (b) 1 double bond (c) 2 double bonds (d) 3 double bonds (e) 4 double bonds 14.Para-xylene is the same as: (a) 1,2-dimethylbenzene (b) 1,3-diethylbenzene (c) 1,3-dimethylbenzene (d) 1,4-diethylbenzene (e) 1,4-dimethylbenzene 15.Which of the following formulas represents an alkene? (a) CH3CH2CH3 (b) CH3CH3 (c) CH3CH2CHCH2 (d) CH3CH2Cl (e) CHCH 16.What is the name of the following compound? (a) 1,3-dibromophenol (b) 2,5-dibromophenol (c) 2,6-dibromophenol (d) m-dibromophenol (e) o-dibromophenol 17.Which one of the following is a secondary alcohol? (a) CH3CH2OH (b) CH3OH (c) CH3CH(OH)CH3 (d) (CH3)C3OH (e) none of these 18.Select the IUPAC name for: (CH3)2CHCH(OH)CH2C(CH3)3. (a) 2,5,5-trimethyl-3-hexanol (b) 1,1,4,4-pentamethylbutanol (c) 1,1-dimethylisopentanol (d) 2,5-dimethyl-4-hexanol (e) none of these 19.Which is NOT a physical property of alcohols or phenols? (a) Phenols are generally only slightly soluble in water. (b) The solubilities of normal primary alcohols in water decrease with increasing molecular weight. (c) The hydroxyl group of an alcohol is nonpolar. (d) Due to hydrogen bonding, boiling points of alcohols are much higher than those of corresponding alkanes. (e) Boiling points of normal primary alcohols increase with increasing molecular weight. 20.Give the IUPAC name of this compound: CH3OCH2CH3. (a) dimethyl ether (b) methoxyethane (c) methylethyloxide (d) propyl ether (e) none of the above 21.The compound below is classified as a _____ . (a) primary amine (b) secondary amine (c) tertiary amine (d) primary amide (e) secondary amide 22.The systematic name for the compound in Problem 21 is _____ . (a) pentyl amine (b) methyl-n-propyl amine (c) diethyl amine (d) 2-aminopentane (e) isobutylamine 23.Select the IUPAC name for the compound below. (a) 2,4-dimethylpentanoic acid (b) 1,1,3-trimethylbutanoic acid (c) 1-hydroxy-2,4-dimethylpentanone (d) 2-carboxyisohexane (e) none of these 24.Select the best name for: (a) m-chlorobenzoic acid (b) o-chlorobenzaldehyde (c) p-chlorobenzoate (d) m-chlorosalicylic acid (e) none of these 25.The best classification for the following compound is: _____ . (a) aldehyde (b) ester (c) ketone (d) carboxylic acid (e) alcohol 26.The compound given below is called _____ . (a) butyl acetate (b) ethyl pentanoate (c) propyl pentanoate (d) ethyl butanoate (e) butyl ethanoate 27.The compound illustrated below is called _____ . (a) acetamide (b) formyl acetamide (c) dimethyl acetate (d) N,N-dimethylformamide (e) dimethylamine 28.The functional group given below is characteristic of organic _____ . (a) ketones (b) acids (c) aldehydes (d) esters (e) alcohols

Answers:

1. (d) 2. (c) 3. (b) 4. (c) 5. (c) 6. (b) 7. (b) 8. (a) 9. (a) 10. (c) 11. (d) 12. (a) 13. (a) 14. (e) 15. (c) 16. (c) 17. (c) 18. (a) 19. (c) 20. (b) 21. (b) 22. (d) 23. (a) 24. (a) 25. (b) 26. (b) 27. (d) 28. (a)

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