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Hydrocarbons are Fun! Trivia Quiz

Hydrocarbons are the base of organic chemistry. See if you can answer a few questions about them. Don't forget to have fun.

A multiple-choice quiz by Nigol123. Estimated time: 4 mins.

Author
Nigol123

Time
4 mins

Type
Multiple Choice

Quiz #
327,019

Updated
Oct 02 24

# Qns
10

Difficulty
Average

Avg Score
6 / 10

Plays
972

One at a Time - Single Page - Timed Game

Question 1 of 10

1. Which element may appear in hydrocarbons? Hint

Oxygen

None of these

Chlorine

Nitrogen

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Question 2 of 10

2. Which of these hydrocarbons is impossible to find in nature? Hint

Methyne

Propene

Ethane

Butyne

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Question 3 of 10

3. Which of these is characteristic of alkanes? Hint

Free existence in nature

Carbon-carbon single covalent bonds

All of these

Low reactivity

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Question 4 of 10

4. Which hydrocarbon is impossible to find in nature? Hint

Cyclohexane

Nonene

Octane

Cycloethane

5. There are two unlabeled beakers (A) and (B). One of them contains octene, and the other contains heptane. We mix bromine solution with each hydrocarbon, and we notice that the liquid in beaker (B) decolorizes bromine solution. Which beaker contains heptane? Hint

Bromine solution is colorless

It cannot be determined from the information given

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Question 6 of 10

6. Which hydrocarbon has all its carbon atoms in its sp3 hybrid state? Hint

Hexyne

None of these

Ethene

Octane

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Question 7 of 10

7. The benzene molecule is a stable molecule. What makes it stable? Hint

Benzene is not stable

Its molecular formula (C6H6)

The delocalization of single and double covalent bonds

Its odor

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Question 8 of 10

8. What is the difference between the chlorination of propane and the chlorination of butene? Hint

Chlorination of butene is an addition reaction, whereas chlorination of propane is a substitution reaction

Propane can never react due to its stability

Butene cannot undergo chlorination

There are no difference between these reactions

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Question 9 of 10

9. Which compound is a positional isomer of 2,3-dimethyl-1-butene? Hint

2,3-dimethyl-3-ethyl-1-butene

2-methyl-1-pentene

2,3-dimethyl-2-butene

3-methyl-1-pentene

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Question 10 of 10

10. Which compound is the most reactive? Hint

Pentene

Cychlooctane

Hexane

Butyne

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Quiz Answer Key and Fun Facts

1. Which element may appear in hydrocarbons?

Answer: None of these

There are many organic compounds that contain oxygen, nitrogen, and chlorine. However, it is impossible to find a hydrocarbon that contains these elements. Hydrocarbons contain carbon and hydrogen only.

2. Which of these hydrocarbons is impossible to find in nature?

Answer: Methyne

Methyne does not exist in nature. To be an alkyne, the hydrocarbon must have two carbon atoms to form triple covalent bonds, whereas methyne has only one carbon atom.

3. Which of these is characteristic of alkanes?

Answer: All of these

The functional group of an alkane is carbon-carbon single covalent bond. This is why the alkanes are stable and exist free in nature (in petroleum and natural gas).

4. Which hydrocarbon is impossible to find in nature?

Answer: Cycloethane

Cycloethane does not exist in nature. In order for a hydrocarbon to have a cyclic structure, it must have three carbon atoms or more, whereas ethane has only two carbon atoms.

Answer: A

When an alkene (octene) reacts with bromine solution, its double bonds cause the decolorization of the solution. Then, beaker (B) contains octene, and beaker (A) contains heptane, which is an alkane with seven carbon atoms. The color of bromine solution is orange.

6. Which hydrocarbon has all its carbon atoms in its sp3 hybrid state?

Answer: Octane

In order to be in sp3 hybrid state, the carbon atom must form single bonds only. Octane has single covalent bonds, whereas hexyne has triple covalent bonds, and ethene has double covalent bonds.

7. The benzene molecule is a stable molecule. What makes it stable?

Answer: The delocalization of single and double covalent bonds

Benzene is stable due to the delocalization of single and double covalent bonds. The single bonds are hard to break. That's why the benzene molecule is stable.

8. What is the difference between the chlorination of propane and the chlorination of butene?

Answer: Chlorination of butene is an addition reaction, whereas chlorination of propane is a substitution reaction

Alkanes (propane) undergo substitution reactions only. Alkenes (butene) undergo addition reaction by breaking their pi bond.

9. Which compound is a positional isomer of 2,3-dimethyl-1-butene?

Answer: 2,3-dimethyl-2-butene

In order to become a positional isomer, the molecular formula and the structure of the hydrocarbon must never change, whereas the position of the functional group must change. 2,3-dimethyl-1-butene has the double bond on the first carbon atom, whereas 2,3-dimethyl-2-butene has the double bond on the second carbon atom. 2-methyl-1-pentene and 3-methyl-1-pentene are structural isomers. 2,3-dimethyl-3-ethyl-1-butene is not an isomer of 2,3-dimethyl-1-butene because its molecular formula is different.

10. Which compound is the most reactive?

Answer: Butyne

Butyne has a triple covalent bond with two very weak pi bonds that break easily. It is easier to break two pi bonds than one pi bond (like in pentene). Hexane and cyclooctane do not have pi bonds. They are stable molecules.

Source: Author Nigol123

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