HYDROCARBON QUIZES Part III

CHEMICAL REACTION


1. Alkanes are saturated hydrocarbons and therefore, are generally ….
a. reactive
b. unreactive
c. quite reactive
d. more reactive than alkenes
e. less reactive than alkenes

2. The balanced equation for the combustion of pentane is ….
a. C3H8 + 5 O2 → 3 CO2 + 4 H2O
b. C5H12 + 8 O2 → 5 CO2 + 6 H2O
c. 2 C3H8 + O2 → 3 CH4 + 2 H2O
d. 2 C5H12 + 2 O2 → 10 CH4 + 2 H2O
e. 4 C5H12 + 2 O2 → 20 CH4 + 4 H2O

3. The reaction of alkanes with halogens is called ….
a. addition
b. substitution
c. oxidation
d. combustion
e. hydrogenation

4. What is the major product obtained from the monobromination of 2-methylbutane in the presence of light at room temperature?
a. 1-bromo-2-methylbutane
b. 2-bromo-2-methylbutane
c. 2-bromo-3-methylbutane
d. 3-bromo-2-methylbutane
e. 1-bromo-3-methylbutane

5. Alkanes react with the halogens via free-radical substitution reaction in the presence of sunlight. When methane reacts with chlorine in sunlight, so ….
a. a chain reaction is may not be occurred
b. a carbon tetrachloride is the main product
c. one or more chlorine atoms may replease hydrogen atoms
d. the products do not depend on the amounts of halogen and alkane
e. the yellowish-green colour of Cl2 fades and HCl(g) can be detected

6. The product of the hydrogenation of 2-butene is ….
a. n-butane
b. butane
c. 2-butane
d. 2-butene
e. 2-methylpropane

7. With which of the following would you expect to observe a color change when it was mixed with bromine water?
a. n-butane
b. 2-butene
c. 2-methylpropane
d. 2-methylbutane
e. Cyclobutane

8. The addition of Br2 to an alkene occurs so readily that bromine dissolved in carbon tetrachloride, CCl4. It is a useful reagent to test for unsaturation. When a few drops of the solution are added to an alkene, so ….
a. the bromine immediately react
b. the color of bromine changes
c. the reaction occurs suddently
d. the redbrown color of the bromine changes
e. the redbrown color of the bromine is immediately lost

9. The correct statement about the Markownikoff’s rule is ….
a. the richer gets rich
b. there is only one product formed
c. HBr is a symmetrical reagents
d. H2O could not be added to alkenes
e. H atom of HCl attacts C atom of C = C

10. The main product when HBr adds to 1-butene is ….
a. 2-butene
b. n-butane
c. 1-bromobutene
d. 1-bromobutane
e. 2-bromobutane

11. The addition of HCl to 2-methyl-2-butene follows Markovnikov's Rule. The product is
a. 2,3-dichloro-2-methylbutane
b. 2-chloro-2-methylbutane
c. 3-chloro-2-methylbutane
d. 1-chloro-2-methylbutane
e. 2-chlorobutane

12. If an excess of HCl is added to CH3C≡CH, the product is ….
a. propene
b. propane
c. 1-chloropropene
d. 1,1-dichloropropane
e. 2,2-dichloropropane

13. The reaction between CH2CHCH3 and H2O(g) will produce ….
a. Propene
b. propane
c. 1-propanol
d. 2-propanol
e. 1,2-propanediol

14. Ethene undergoes addition polymerization to give ….
a. ethane
b. butane
c. micromolecules
d. polyethene
e. polyethane

15. If 1-pronanol is added by sulfuric acid at 180ºC, the main product is ….
a. propane
b. propune
c. propene
d. 2-propanol
e. Propilsulphate

16. Butylbromide reacts with potassium hydroxide in alcohol. The main product is …
a. 1-chlorobutane
b. 2-chlorobutane
c. 1-chlorobutane
d. butane
e. butane

17. Which of the following could be dehydrohalogenated to give 2-butyne?
a. 2,2,3,3-tetrabromobutane
b. 2,2-dibromobutane
c. 1,4-dibromobutane
d. 1,2,3,4-tetrabromobutane