Chapter 20 practice exam 1. what is the general formula for an alkene a. C n H 2n+2 b. C n H 2n c. C n H n-2 d. C n+2 H n e. C n H 2n-2 2. Structural, or constitutional isomers are compounds that have a. The same molar masses but different elemental composition b. Have identical structures but contain different isotopes of the same elements c. Two or more double bonds d. The same elemental composition but different molar masses e. The same elemental composition but the atoms are linked in different ways 3. Which of the following is a structural (constitutional) isomer of butane a. 1-butene b. 1-propene c. cyclopropane d. 2-methylpropane e. cyclobutane 4. which one of the following molecules has a chirality center a. 1 b. 2
Transcript
Chapter 20 practice exam
1. what is the general formula for an alkene a. CnH2n+2
b. CnH2n
c. CnHn-2
d. Cn+2Hn
e. CnH2n-2
2. Structural, or constitutional isomers are compounds that have a. The same molar masses but different elemental composition b. Have identical structures but contain different isotopes of the same
elements c. Two or more double bonds d. The same elemental composition but different molar massese. The same elemental composition but the atoms are linked in different
ways
3. Which of the following is a structural (constitutional) isomer of butane a. 1-buteneb. 1-propenec. cyclopropaned. 2-methylpropanee. cyclobutane
4. which one of the following molecules has a chirality center
a. 1b. 2c. 3d. 4e. 5
5. why are geometric isomers possible for alkenes but not for alkanes a. the geometry in an alkene is tetrahedralb. there are four bonds formed by carbon atoms in alkenes c. the bond angle in the alkene is not 120d. the alkene has a hybridization of sp3e. there is restricted rotation about the double bond in an alkene
6. for which one of the following molecules do geometric isomers (cis-trans) exist
a. H3C-CH3
b. H3C-CH2Fc. ClH2C-ClC=CHCH2Brd. BrHC=CHBre. BrHC=CCl2
7. Which compound has the highest boiling point a. C5H12
b. C7H14
c. C7H16
d. C9H20
e. C4H10
8. Name the following compound
a. 2-bromo-1-chlorobutane b. 3-bromo-1-chlorobutanec. 2-bromo-4-chlorobutaned. 3-bromo-1-chlorohexane e. 1-bromo-3-chloropropane
9. give the name of the following compound
a. trimethylpropaneb. cyclopropane methanec. 2-methylpropaned. 1,1-dimethylcyclopropanee. propyldimethane
10. which of the following molecules is most likely an alkyne a. C6H6
b. C6H12Oc. C6H10
d. C6H12
e. C6H14
11. Name the following compound
a. 4-propyne-4-methyl-2-pentaneb. 2,2-dimethyl-4-hexyne c. 4-ethyl-4-methyl-2-pentyne d. 4,4-dimethyl-2-hexynee. 3,3-dimethyl-4-hexyne
12. what is one way to distinguish between a branched chain alkane and a straight chain alkane
a. the branched chain alkane has a carbon bound to only one carbon atom
b. there are four bonds formed by carbon atoms in a branched chain alkane
c. only three bonds are formed by carbon atoms in a branched chain alkane
d. the branched chain alkane resembles and alkyne e. the branched chain has at least one carbon bounds to three or four
other carbon atoms
13. what is the name of the following compound
a. 2,5-dimethylheptane b. 2,5-diheptane c. 2-ethyl-5-methylhexane d. 3,6-dimethylheptane e. 1,1,4-trimethylhexane
14. what is the molecular formula for the molecule shown
a. C10H20
b. C9H20
c. C8H20
d. C11H24
e. C11H20
15. An unsaturated hydrocarbon is a. A hydrocarbon that contains oxygen b. A compound in which all the carbon atoms have four single bonds c. A compound with at least one double or one triple bond d. A hydrocarbon that is a gas at room temperature e. A cycloalkane with five or more carbons
16. Write the balanced chemical equation that represents the addition of Cl2 to CH3CH=CH2
a. CH3CH=CH2 + Cl2 CH3CHClCH3 + HClb. CH3CH=CH2 + Cl2 CH3CCl=CHCl + H2 c. CH3CH=CH2 + Cl2 CH3CHClCH2Cl d. CH3CH=CH2 + 2Cl2 CH3CHCl2 + CH2Cl2
e. CH3CH=CH2 + 2Cl2 CH3CCl2CHCl2 + H2
17. What is the hybridization of the two carbon atoms that form the triple bond in an alkyne
a. Sp2b. Spc. Sp3d. Sp3de. Sp3d2
18. name the compound
a. 2-methyl-4-penteneb. 1,1-dimethyl-3-butene
c. 4-methyl-1-pentene d. hexane e. 2-methylpentane
19. which of the following compounds exhibits optical isomerism a. CH2Cl2
b. CF2BrIc. CH3CHClBrd. CHBr2Ie. CH3Cl
20. which of the following statements is true?a. Geometric isomers (stereoisomers) can occur without a C-C single
bondb. A pair of chiral molecules are called enantiomersc. When naming alkenes and alkynes always number from the first
substituentd. Alkenes use the suffix ending in -ynee. Alkynes have one pi and one sigma bond
