1. Which of the following molecules has the molecular formula C5H10?
a. cyclopentane
b. pentane
c. 2-methylpentane
d.1-methylcyclobutane
2. Which of the following only contains secondary carbons?
a. 3-methlhexane
b. hexane
c. cyclohexane
d.1,3-dimethylcyclopentane
3. How many hydrogen atoms are bonded to a secondary carbon?
a. zero
b. one
c. two
d. three
4. How many hydrogen molecules are in an alkane with 6 carbons?
a. 14
b. 12
c. 10
d. 16
5. Which of the following does not occur with increasing the number of carbons in alkanes?
a. increasing the boiling point of the compound
b. increasing polarity of the compound
c. increasing the number of hydrogens in the molecule
d. none of the above
Use the following diagram to answer Questions 6-8
6. How many primary carbons are there in the molecule represented above?
a. one
b. two
c. three
d. four
7.How many secondary carbons are there in the molecule above?
a.one
b.two
c.three
d.four
8. How many tertiary carbons are there in the molecule above?
a. one
b. two
c. three
d. four
9. Which of the following molecules would be referred to as saturated?
a.benzene
b. 2-pentene
c. 3-methyl-2-hexene
d. 3,4-dimethyloctane
10. What are the products in the balance chemical equation representing combustion of butane?
a.4 CO2 + 5 H2O
b.4 CO2 + 4 H2O
c.5 CO2 + 5 H2O
d.5 CO2 + 4 H2O
11. How many bonds would an atom of oxygen be expected to make to complete its octet?
a.one
b.two
c.three
d.four
12. What is the IUPAC name of the following molecule?
a. 2-methylpentane
b. 4-methylpentane
c.hexane
d. 1,1-dimethylbutane
13. The following atoms are ______isomers.
a.conformational
b.structural
c.geometric
d.none of the aboce
14. In alkanes, boiling points ______with increasing molecular weight and ______with branching.
a.increase, decrease
b.decrease, increase
c.decrease, decrease
d.increase, increase
15. When you difluorinate pentane, ______hydrogens are replaces with fluorine. ______molecules of HF are formed.
a. 2, 2
b. 1, 1
c. 1, 2
d. 2,1
16. In _____ isomers, the large groups are on the ______of the double bond.
a.cis, same
b.cis, different
c.trans, same
d.none of the above
17. What is the name of the following molecule?
a. 1, 1-dimethyl-1-pentene
b. 2-methyl-2-hexene
c.trans-2-methyl-2-hexene
d.cis-2-methyl-2-hexene
18. What is the product from the reaction of 2-butene and HBr?
a. 2-bromo-2-butene
b. 3-bromo-2-butene
c. 2-bromobutane
d. 3-bromobutane
19. What is the product from the reaction of 2-butene and Cl2?
a. 2,2-dichlorobutane
b. 2,3-dichlorobutene
c. 2,3-dichlorobutane
d. 2,2-dichlorobutene
20. What is the product of the reaction of 2-pentene and H2?
a.2-hydropentene
b.pentane
c.cyclopentane
d.none of the above
21. According to Markovnikof’s rule, which carbon would the fluorine add to if 2-methyl-2-pentene were reacted with HF?
a. A
b. B
c. C
d. D
22. The following molecule is a _____ alcohol.
a.primary
b.secondary
c.tertiary
d.quarternary
23. What is the name of the following molecule?
a. 3, 4-dimethyl-2-hexanol
b.3, 4-dimethyl-5-hexanol
c.1, 3, 4-trimethyl-1-pentanol
d. 4-ethyl-3,4-dimethyl-2-butanol
24. What happens when you dehydrate an alcohol?
a.form an alkane
b.form an alkene
c.form an ether
d.nothing happens
25. As molecular weight increases, boiling point ______in alcohols. Alcohols ______soluble in water.
a.decreases, are not
b.increases, are not
c.decreases, are
d.increases, are
26. Alcohols ______hydrogen bond. They have _____ boiling points than ethers.
a.can, higher
b.can, lower
c.cannot, higher
d.cannot, lower
27. Hydrogen bonds occurs between
a.an H attached to an electronegative atom
b.an electronegative atom
c. A and B
d.none of the above
28.The bond between sodium and chlorine is a(n) ______bond. Chlorine contains _____ lone pairs of electrons.
a.ionic, 3
b.ionic, 6
c.covalent, 3
d.covalent, 6
29. In a trigonal planar electron geometry, which of the following would you expect?
a. 2 electron groups
b. 2 lone pairs of electrons
c. 3 electron groups
d. 4 electron groups
30. Water has a ______electron geometry.
a.linear
b.trigonal planar
c.tetrahedral
d.bent
Short answer
Explain why two alkanes with the same formula of C5H12 have different boiling points.
Branching-for example octane and 2-ethyl-3-methylpentane both share the formula C8H18 however, octane has a higher boiling point than 2-ethyl-3-methylpentane.
Draw and name 5 isomers of C6H14.
NOTE 2-ethylbutane is actually 3-methylpentane
There are more than this. These are some examples.
The following reactions start with 1-pentene. Draw the molecule and then complete the reactions with H2, Cl2 and HF. Name the reaction.
Hydrogenation
Halogenation
*** There should not be an HCl on the end of this picture. That is a mistake.
Hydrohalogenation
The Cl should be an F and there is one too many carbons on the product.
SORRY! My computer isn’t letting me into my molecule sketcher.