Ethane and ethyne can be differentiated by:

Dilute alkaline aqueous solution of KMnO4

Organic Chemistry Quiz: Hydrocarbons

Reviewed by Janyce Wowk

Janyce Wowk, BS (Chemistry) |

Chemistry

Review Board Member

Janyce Wowk is a chemistry professional with a B.S. in Chemistry from Montclair State University. Her experience as a research assistant and lab technician in a PFAS laboratory has allowed her to develop strong laboratory, data analysis, and research skills.

, BS (Chemistry)

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Questions and Answers

1.

Which molecule contains a carbon-carbon double bond?
- A.
  
  Ethane
- B.
  
  Ethene
- C.
  
  Ethyne
- D.
  
  Ethyl alcohol
Correct Answer
B. Ethene

Explanation
Ethene is the correct answer because it is the only molecule listed that contains a carbon-carbon double bond. Ethane, ethyne, and ethyl alcohol do not have a carbon-carbon double bond. Ethene, also known as ethylene, is a hydrocarbon with the chemical formula C2H4 and consists of two carbon atoms bonded together by a double bond.

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2.

Which product is obtained when chloromethane (or methyl chloride) is reduced?
- A.
  
  Ethane
- B.
  
  Ethene
- C.
  
  Methane
- D.
  
  Ethyne
Correct Answer
C. Methane

Explanation
Chloromethane, also known as methyl chloride, is reduced to produce methane. Reduction is a chemical reaction in which a molecule gains electrons or hydrogen atoms, resulting in a decrease in oxidation state. In this case, chloromethane gains hydrogen atoms to form methane, which is the product of the reduction reaction.

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3.

Which reacts explosively with methane?
- A.
  
  F₂
- B.
  
  Cl₂
- C.
  
  Br₂
- D.
  
  I₂
Correct Answer
A. F₂

Explanation
Fluorine (F2) reacts explosively with methane due to its high reactivity and strong oxidizing properties. Fluorine is the most electronegative element, and it readily accepts electrons from other elements, including carbon in methane. This reaction releases a large amount of energy, resulting in an explosive reaction. Chlorine (Cl2), bromine (Br2), and iodine (I2) are also halogens but are less reactive than fluorine and do not react explosively with methane.

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4.

By dehydration we mean, the removal of:
- A.
  
  Hydrogen
- B.
  
  Water
- C.
  
  Halogen
- D.
  
  Hydrogen halide
Correct Answer
B. Water

Explanation
Dehydration refers to the removal of water from a substance. In this context, the correct answer is "Water" because dehydration specifically involves the elimination or loss of water molecules.

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5.

Ethane and ethyne can be differentiated by:
- A.
  
  Hydrogenation
- B.
  
  Bromine water
- C.
  
  Dilute alkaline aqueous solution of KMnO₄
- D.
  
  Hydrohalogenation
Correct Answer
B. Bromine water

Explanation
Bromine water can be used to differentiate between ethane and ethyne because ethyne is an unsaturated hydrocarbon and will react with bromine water, causing it to decolorize. Ethane, on the other hand, is a saturated hydrocarbon and will not react with bromine water, so the solution will retain its original color. Therefore, the observation of decolorization of bromine water can be used to identify ethyne.

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6
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6.

Which is used for dehydrohalogenation?
- A.
  
  Br₂, water
- B.
  
  Conc. H₂SO₄
- C.
  
  Al₂O₃
- D.
  
  Alcoholic KOH
Correct Answer
D. Alcoholic KOH

Explanation
Alcoholic KOH is used for dehydrohalogenation. Dehydrohalogenation is a chemical reaction in which a hydrogen halide is eliminated from a molecule, resulting in the formation of a double bond. Alcoholic KOH, or potassium hydroxide dissolved in alcohol, is a strong base that can abstract a hydrogen atom from a molecule, leading to the elimination of a halogen atom and the formation of a double bond. This reaction is commonly used in organic chemistry to synthesize alkenes from alkyl halides.

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7.

Which substance reacts with KMnO₄to produce oxalic acid?
- A.
  
  Ethane
- B.
  
  Ethene
- C.
  
  Ethyne
- D.
  
  Ethyl alcohol
Correct Answer
C. Ethyne

Explanation
Ethyne (also known as acetylene) reacts with KMnO4 to produce oxalic acid. This reaction is a typical example of an oxidative cleavage reaction. Ethyne is a highly reactive compound due to the presence of a triple bond between carbon atoms. When ethyne reacts with KMnO4, the triple bond is broken, and two carboxylic acid groups are formed, resulting in the production of oxalic acid. This reaction is commonly used in organic chemistry for the synthesis of oxalic acid.

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8.

The reaction of alkyl halides takes place in the presence of
- A.
  
  Al₂O₃at 350 ⁰c
- B.
  
  Conc. H₂SO₄ at 170 ⁰C
- C.
  
  Zn (dust)
- D.
  
  Zn + HCl
Correct Answer
D. Zn + HCl

Explanation
Zinc (Zn) reacts with hydrochloric acid (HCl) to form zinc chloride (ZnCl2) and hydrogen gas (H2). This reaction is commonly used in the laboratory to generate hydrogen gas. The reaction between Zn and HCl is a redox reaction, where zinc is oxidized to zinc ions (Zn2+) and hydrogen ions (H+) are reduced to form hydrogen gas. The reaction occurs at room temperature and does not require any catalyst.

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3
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9.

Which process produces an alkane?
- A.
  
  Combustion
- B.
  
  Hydration
- C.
  
  Dehydration
- D.
  
  Hydrogenation
Correct Answer
D. Hydrogenation

Explanation
Hydrogenation is the process that produces an alkane. This process involves the addition of hydrogen gas (H2) to an unsaturated hydrocarbon, such as an alkene or alkyne, resulting in the formation of a saturated hydrocarbon, which is an alkane. During hydrogenation, the double or triple bond in the unsaturated hydrocarbon is broken, and hydrogen atoms are added to the carbon atoms, resulting in the formation of single bonds. This process is commonly used in the food industry to convert unsaturated vegetable oils into solid fats, such as margarine, by adding hydrogen to the double bonds present in the oils.

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10.

Does not react with aqueous solution of bromine?
- A.
  
  C₂H₆
- B.
  
  C₂H₄
- C.
  
  C₂H₂
- D.
  
  C₃H₆
Correct Answer
A. C₂H₆

Explanation
C2H6, also known as ethane, does not react with aqueous solution of bromine. Ethane is a saturated hydrocarbon with only single bonds between carbon atoms. Bromine, being a halogen, typically reacts with unsaturated hydrocarbons that have double or triple bonds, such as C2H4 (ethylene) and C2H2 (acetylene). Since ethane does not have any double or triple bonds, it does not undergo a reaction with bromine in an aqueous solution.

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Janyce Wowk |BS (Chemistry) |

Chemistry

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Dec 09, 2020

Quiz Created by
Alfredhook3

Organic Chemistry Quiz: Hydrocarbons

Which molecule contains a carbon-carbon double bond?

Which product is obtained when chloromethane (or methyl chloride) is reduced?

Which reacts explosively with methane?

By dehydration we mean, the removal of:

Ethane and ethyne can be differentiated by:

Which is used for dehydrohalogenation?

Which substance reacts with KMnO4 to produce oxalic acid?

The reaction of alkyl halides takes place in the presence of

Which process produces an alkane?

Does not react with aqueous solution of bromine?

Which substance reacts with KMnO₄to produce oxalic acid?