Organic Chemistry Study Questions – Formulas, Names & Properties

January 31, 2019

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) C_nH_2n+2; (b) C_nH_2n; (c) C_nH_2n-2; (d) C_nH_n+2; (e) C_nH_n
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)