Organic Chemistry - Shapes, Reactions & Biopolymers Examples of Multiple Choice Questions

1.

Two isomeric forms of a saturated hydrocarbon

(a) have the same structure.

(b) have different compositions of elements.

(c) have the same molecular formula.

(d) have a different content of the isotopes of hydrogen.

(e) react vigorously with one another.

2.

Which of the following hydrocarbons does not have isomers?

(a) C₇H₁₆

(b) C₆H₁₄

(c) C₅H₁₀

(d) C₄H₈

(e) C₃H₈

3.

The name of the alkane isomer of cis-3-hexene is:

(a) 2-methylpentane

(b) 3-methylpentane

(c) n-hexane

(d) 2,3-dimethylbutane

(e) cyclohexane

4.

How many aromatic isomers of dibromobenzene exist?

(a) 2

(b) 3

(c) 4

(d) 6

(e) 8

5.

Which one of the following compounds is an isomer of CH₃CH₂CH₂CH₂OH?

(a) CH₃CH₂CH₂OH

(b) CH₃CH(OH)CH₃

(c) CH₃CH₂CH₂CHO (Note: This is one way to write an aldehyde.)

(d) CH₃CH₂CH₂CH₃

(e) none of the above

6.

Which of the following compounds is a functional group isomer of C₂H₅OH, ethanol (ethyl alcohol)?

(a) ethanal, CH₃CHO

(b) acetic acid, CH₃COOH

(c) diethyl ether, (C₂H₅)₂O

(d) dimethyl ether, (CH₃)₂O

(e) propanol, C₃H₇OH

7.

For which of the compounds below are cis-trans isomers possible?

CH3CH=CH2	CH3CH=CHCH2CH3	CH3CH=CHCH3
(1)	(2)	(3)

(a) only 2

(b) both 1 and 2

(c) both 2 and 3

(d) all three

(e) only 3

8.

Which of the following does NOT exhibit geometric isomerism? (Hint: draw them!)

(a) 4-octene

(b) 2-pentene

(c) 3-hexene

(d) 2-hexene

(e) 1-hexene

9.

Which of the following compounds displays optical isomerism?

(a) CH₂(OH)-CH₂(OH)

(b) CH₃-CHCl-COOH

(c) CH₂=CHCl

(d) CHCl=CHCl

(e) CH₃-O-C₂H₅

10.

How many isomeric alkanes of the molecular formula C₅H₁₂ are there?

(a) 1

(b) 2

(c) 3

(d) 4

(e) 5

11.

How many alcohols are structural isomers with the formula: C₅H₁₁OH?

(a) 5

(b) 6

(c) 7

(d) 8

(e) 9

12.

What is the relationship between the structures shown?

(a) structural isomers

(b) geometric isomers

(c) conformational structures

(d) identical structures

(e) optical isomers

13.

Which of the following statements concerning conformations is (are) TRUE?

(1) Ethane has an infinite number of conformations.

(2) The eclipsed conformation of a molecule is slightly more stable and energetically favored than the staggered conformation.

(3) A conformation is one specific geometry of a molecule.

(a) 1 only

(b) 2 only

(c) 1 and 2

(d) 2 and 3

(e) 1 and 3

14.

Which of the following statements is FALSE regarding the reaction between Cl₂ and C₂H₆?

(a) It is a substitution reaction.

(b) The reaction will give a single product of C₂H₅Cl.

(c) The reaction mechanism involves free radicals.

(d) The reaction can be initiated with either sunlight or heat.

(e) The first step in the mechanism is the cleavage of the Cl-Cl bond to give chlorine atoms.

15.

Which of the following will undergo an addition reaction with chlorine?

(a) CH₃CH₂CH₂CH₃

(b) CH₃CH₂CH=CHCH₃

(c) C₆H₆

(d) CH₃CH₂COOH

(e) CH₃CH₂OH

16.

What is the expected product formed from the reaction between 2-butene and Cl₂?

(a) 1-chlorobutane

(b) 2-chlorobutane

(c) 2,3-dichlorobutane

(d) 2,2-dichlorobutane

(e) 3,3-dichlorobutane

17.

The reaction of ethyne with which of the following gives CH₂Br-CHBrCl?

(a) HCl, then HBr

(b) HCl, then Br₂

(c) Cl₂, then HBr

(d) Cl₂, then Br₂

(e) H₂, then Br₂

18.

Dehydration of an alcohol leads to the formation of an _____ .

(a) alkene

(b) alkane

(c) alkyne

(d) alkyl halide

(e) aldehyde

19.

A reaction in which a carboxylic acid reacts with a base to form a salt and water is called _____ .

(a) ionization

(b) esterification

(c) hydrolysis

(d) saponification

(e) neutralization

20.

How many moles of sodium hydroxide will react with one mole of:

(a) 5

(b) 4

(c) 3

(d) 2

(e) 1

21.

Ethanol can be oxidized stepwise. What is the first stable intermediate product when ethanol is oxidized with a mild oxidation agent?

(a) CH₃COOH

(b) CO₂

(c) CH₃CHO

(d) CH₃CH₂OH

(e) CH₃OCH₃

22.

Which of the following alcohols forms a ketone when oxidized?

(a) 1-propanol

(b) methanol

(c) 2-methyl-2-propanol

(d) 2-propanol

(e) all of the above

23.

What is the sum of the coefficients in the balanced equation for the complete combustion of 2-methylbutane? Use smallest whole number coefficients. Do not forget coefficients of 1.

(a) 10

(b) 13

(c) 17

(d) 20

(e) 23

24.

The organic starting materials for the preparation of an ester could be _______ .

(a) an acid and an alcohol

(b) a ketone and an alcohol

(c) an alkane and a ketone

(d) only an acid

(e) an amine and an acid

25.

Hydrolysis (saponification) of a fat would yield ______ .

(a) water and an alkene

(b) ethanol and propanoic acid

(c) glycerol and soap

(d) ethanol and a soap

(e) a triester of glycerol with fatty acids

26.

The segment -CH₂CH₂CH₂CH₂CH₂CH₂- represents the polymer named _______ .

(a) polybutylene

(b) polyhexene

(c) polypropylene

(d) polystyrene

(e) polyethylene

Answers:

1. (c) 2. (e) 3. (e) 4. (b) 5. (e) 6. (d) 7. (c) 8. (e) 9. (b) 10. (c) 11. (d) 12. (c) 13. (e) 14. (b) 15. (b) 16. (c) 17. (b) 18. (a) 19. (e) 20. (e) 21. (c) 22. (d) 23. (d) 24. (a) 25. (c) 26. (e)

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