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11) In the rings of heterocyclic compounds we can find one or more atoms that are not carbon atoms 12) The compound with formula C4H9N has two degrees of unsaturation. 13) Choose the INCORRECT statement. A) Hydrocarbons are compounds of carbon and hydrogen. B) Skeletal isomerism is also called chain isomerism. C) Isomers have the same chemical formula but differ with respect to the arrangement of atoms. D) Saturated hydrocarbons have only single bonds connecting each atom. E) Organic compounds can be obtained only from living tissue. 14) Choose the INCORRECT statement. A) Latin prefixes provide information on the numbers of C atoms in a chain. B) An alkane group used as a side chain group is called an alkyl group. C) Di, tri, and tetra can be used to designate the number of side chain groups. D) Positional isomers differ in the position on the main chain of the side chain group. E) Functional groups are distinctive groupings of one or more atoms. 15) The IUPAC name of tert-butyl group is: A) 1,1-dimethylethyl B) 1,1-dimethylethane C) 1,2-dimethylethyl D) 1-methylpropyl E) 2-methylpropyl 16) What is the correct IUPAC name for the following structure? A) 2-ethyl-3- methylheptane B) 3, 5 – dimethyloctane C) 4-methyl-6-ethylheptane D) 4, 6 – dimethyloctane E) 3, 5 – dimethyloctyl 17) Which of the following classes of organic compounds and their general structural formulas have been correctly matched? I) ester:IV) Carboxylic acid: II) Aldehyde:V) Amide: Â III) Ketone: Â A) I), II), and V) B) II), III), and V) C) III), IV), and V) D) I), IV), and V) E) II), IV), and V) 18) Find the structure for 2,3,5,7-tetramethyloctane A) B) C) D) E) 19) How many primary, secondary, tertiary and quaternary carbon atoms are there in the structure of 2,4,6-trimetylheptane? A) 5 primary, 2 secondary, 2 tertiary and 1 quaternary carbon atoms B) 5 primary, 3 secondary, 2 tertiary and 0 quaternary carbon atoms C) 4 primary, 4 secondary, 2 tertiary and 0 quaternary carbon atoms D) 4 primary, 2 secondary, 2 tertiary and 2 quaternary carbon atoms E) 5 primary, 2 secondary, 3 tertiary and 0 quaternary carbon atoms 20) Which compound is the lowest boiling? A) methane B) ethene C) ethane D) cyclopropane E) ethyne

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