Organic Chemistry Practice Test w Answer Key (Version A)
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Organic Chemistry
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Freshman / 9th Grade
"The Organic Chemistry Practice Test with Answer Key (Version A)" offers students a comprehensive set of practice questions covering key organic chemistry concepts, with a detailed answer key for self-assessment and improved understanding.
REGENTS CHEMISTRY Organic Chemistry Practice Test Name ______________________
Mr. Dolgos Period ____
1. Which organic compound is a saturated 9. Natural gas is mostly comprised of
hydrocarbon? A) methane B) butane
A) ethane B) ethanol C) propane D) ethane
C) ethyne D) ethene
10. Molecules of 2-methyl-propane and n-butane differ
2. Which compound is a saturated hydrocarbon? in their
A) hexane B) hexanal A) number of covalent bonds
C) hexanol D) hexene B) molecular formulas
C) structural formulas
3. Which structural formula correctly represents a D) number of carbon atoms
hydrocarbon molecule?
A) B) 11. Which formula represents butane?
A) CH3CH2CH3 B) CH3CH2CH2CH3
C) CH3CH3 D) CH3CH2CH2CH2CH3
12. Which of the following compounds has the greatest
C) D)
possible number of isomers?
A) propane B) butane
C) ethane D) pentane
13. What is the total number of carbon atoms
4. In saturated hydrocarbons, carbon atoms are
contained in an ethyl group?
bonded to each other by
A) 1 B) 2
A) alternating double and triple covalent bonds
B) alternating single and double covalent bonds C) 3 D) 4
C) single covalent bonds, only
14. Each member in the alkane series of hydrocarbons,
D) double covalent bonds, only
when considered in successive order, has 1 more
carbon atom and how many more hydrogen atoms?
5. Which compound is classified as a hydrocarbon?
A) 1 B) 2
A) chloroethane B) ethanoic acid
C) 3 D) 4
C) ethanol D) ethane
15. Which formula represents an unsaturated
6. Which formula represents a molecule of a
hydrocarbon?
saturated hydrocarbon?
A) CH2CHCl B) CH3CHCH2
A) C2H2 B) C4H10
C) CH3CH2CH3 D) CH3CH2Cl
C) C6H6 D) C5H8
16. Given the structural formula:
7. What is the general formula for the members of
the alkane series?
A) CnH2n B) CnH2n+2
C) CnH2n–2 D) CnH2n–6
8. In which group could the hydrocarbons all belong to
the same alkene series?
A) C2H4, C3H6, C4H8 B) C2H2, C2H4, C2H6
What is the IUPAC name of this compound?
C) C2H4, C2H6, C3H6 D) C2H2, C2H4, C4H8
A) propene B) propane
C) propanone D) propanal
Version A
, Organic Chemistry Practice Test
17. Which structural formula represents a molecule of 20. Which structural formula represents a member of
butane? the alkene series?
A) A)
B)
B)
C)
C)
D)
D)
21. Which compound is a member of the same
homologous series as C3H6?
A) C3H8 B) C2H6
18. The empirical formula of a compound is CH2. Which
C) C2H4 D) C3H4
molecular formula is correctly paired with a
structural formula for this compound?
22. Given the structural formula for ethyne:
A)
B)
What is the total number of electrons shared
between the carbon atoms?
A) 6 B) 2
C) 3 D) 4
C)
23. The compounds 2-butanol and 2-butene both contain
A) carbon atoms B) oxygen atoms
C) double bonds, only D) single bonds, only
D) 24. Which element has atoms that can bond with each
other to form long chains or rings?
A) oxygen B) fluorine
C) nitrogen D) carbon
19. In which pair of hydrocarbons does each compound
25. Which element must be present in an organic
contain only one double bond per molecule?
compound?
A) C4H8 and C2H4 B) C2H2 and C3H6
A) carbon B) nitrogen
C) C6H6 and C7H8 D) C2H2 and C2H6
C) oxygen D) hydrogen
Version A
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