Alkenes Quiz: Alkanes And Alkenes Exam Questions

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Chemistry Expert
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Alkenes Quiz: Alkanes And Alkenes Exam Questions - Quiz

Take this quiz to challenge yourself and test your knowledge of Alkanes and Alkenes! This Alkenes Quiz is designed to test your understanding of alkanes and alkenes, which are types of hydrocarbons commonly studied in organic chemistry. The quiz covers essential concepts related to the structure, nomenclature, and properties of alkanes and alkenes. Challenge yourself with a variety of exam-style questions that assess your knowledge of these important hydrocarbons. This quiz has a few questions that are not just going to test you on how much you know or understand, but this quiz will also give you conceptual clarity and Read morea better understanding of the subject. So, are you ready for it? We wish you good luck with this test! Let's just go for it now!


Questions and Answers
  • 1. 

    Which of the following is not an alkane or alkene?

    • A.

      1-MethylCycloHexene

    • B.

      2-2-3-TriMethylButane

    • C.

      1-Butanol

    • D.

      2-BromoButane

    Correct Answer
    C. 1-Butanol
    Explanation
    1-Butanol is not an alkane or alkene because it contains a hydroxyl group (-OH) attached to the first carbon atom. Alkanes and alkenes are hydrocarbons, meaning they only contain carbon and hydrogen atoms. 1-Butanol is an alcohol, which is a different functional group.

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  • 2. 

    Which of the following is true about alkanes?

    • A.

      They are highly reactive compounds.

    • B.

      They are unsaturated hydrocarbons.

    • C.

      Their melting and boiling points decrease down the group.

    • D.

      They are linked together exclusively by single bonds.

    Correct Answer
    D. They are linked together exclusively by single bonds.
    Explanation
    The correct answer is that alkanes are linked together exclusively by single bonds. This means that all the carbon-carbon bonds in alkanes are single bonds, and there are no double or triple bonds present. This characteristic of alkanes makes them relatively stable and unreactive compared to other types of hydrocarbons. Alkanes are saturated hydrocarbons, meaning that they have the maximum number of hydrogen atoms bonded to each carbon atom. The melting and boiling points of alkanes generally increase as the molecular size and complexity increase, rather than decrease down the group.

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  • 3. 

    What is isomerism?

    • A.

      It is when certain compounds have similar molecular but not structural formulas.

    • B.

      It is when compounds contain the same elements of different isotypes.

    • C.

      It is when compounds are isolated in their physical states.

    • D.

      It is when the atoms of a compound are arranged in a haphazard manner.

    Correct Answer
    A. It is when certain compounds have similar molecular but not structural formulas.
    Explanation
    Isomerism refers to the phenomenon where certain compounds have the same molecular formula but different structural formulas. This means that they have the same types and numbers of atoms, but the arrangement of these atoms within the molecule is different. Isomers exhibit distinct physical and chemical properties due to their different structural arrangements. This concept is important in organic chemistry as it helps to explain the diversity and complexity of organic compounds.

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  • 4. 

    Which of the following is/are characteristic of a homologous series of organic compounds?

    • A.

      Similar structural formula

    • B.

      Similar chemical properties

    • C.

      Similar melting and boiling points

    • D.

      Have a general formula for the series

    • E.

      Similar molecular sizes

    Correct Answer(s)
    A. Similar structural formula
    B. Similar chemical properties
    D. Have a general formula for the series
    Explanation
    A homologous series of organic compounds is a group of compounds that have similar structural formulas, meaning they have the same arrangement of atoms. They also have similar chemical properties, as they have similar functional groups and react in similar ways. Additionally, they have a general formula for the series, which represents the ratio of atoms in the compounds. However, the melting and boiling points may vary within the series due to differences in molecular sizes and intermolecular forces.

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  • 5. 

    Name the test used to determine where an alkene is present.

    • A.

      Water Bromine

    • B.

      Bromine Alkene Test

    • C.

      Bromine water test

    • D.

      None of these

    Correct Answer
    C. Bromine water test
    Explanation
    The test used to determine where an alkene is present is the Bromine water test. In this test, bromine water is added to the sample. If the sample contains an alkene, the reddish-brown color of the bromine water will be decolorized as the bromine reacts with the alkene to form a colorless compound. This reaction is a characteristic reaction of alkenes, making the Bromine water test a useful tool for their identification.

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  • 6. 

    Which of the following is MOST UNLIKELY to be a product of cracking?

    • A.

      Ethene

    • B.

      Propane

    • C.

      Naphtha

    • D.

      Hydrogen gas

    Correct Answer
    C. Naphtha
    Explanation
    Naphtha is most unlikely to be a product of cracking because cracking is a process used to break down larger hydrocarbon molecules into smaller ones. Naphtha is a type of hydrocarbon mixture that contains relatively small molecules, so it is not typically produced through cracking. Ethene, propane, and hydrogen gas, on the other hand, are commonly produced as a result of cracking larger hydrocarbon molecules.

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  • 7. 

    The general formula of alkanes is CnH2n, while those of alkenes is CnH2n+2. True or false?

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The general formula of alkanes is CnH2n, while the general formula of alkenes is CnH2n+2: alkanes have twice the number of hydrogen atoms and two additional hydrogen atoms compared to the number of carbon atoms, and alkenes have twice the number of hydrogen atoms as carbon atoms. Therefore, the correct answer is false.

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  • 8. 

    Which of the following is true of the process of Polymerization? (Select all that apply)

    • A.

      It involves heat, great pressure, and the presence of a catalyst.

    • B.

      It is the process of breaking down a large molecule into smaller molecules.

    • C.

      It is a free radical reaction.

    • D.

      Both A & C

    Correct Answer(s)
    A. It involves heat, great pressure, and the presence of a catalyst.
    C. It is a free radical reaction.
    D. Both A & C
    Explanation
    Polymerisation is a process that involves heat, great pressure, and the presence of a catalyst. It is also a free radical reaction. Therefore, the correct answer is both A and C.

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  • 9. 

    Which of the following is true about polyunsaturated fats?

    • A.

      They have a higher melting point relative to polyunsaturated fats.

    • B.

      They lack the maximum number of hydrogen atoms in their molecules.

    • C.

      They contain only carbon-carbon single bonds.

    • D.

      They are present in oil from lard.

    Correct Answer
    B. They lack the maximum number of hydrogen atoms in their molecules.
    Explanation
    Polyunsaturated fats are true fats that have more than one double bond in their carbon chain. These double bonds cause the molecule to lack the maximum number of hydrogen atoms, which is why this statement is true. The other options are incorrect. Polyunsaturated fats actually have a lower melting point compared to saturated fats (allowing polyunsaturated fats to be liquid at room temperature). They contain carbon-carbon double bonds, and they are commonly found in vegetable oils, not lard.

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  • 10. 

    In "2-MethylButane", the '2' indicates...

    • A.

      The carbon atom on the compound from which a branch will occur.

    • B.

      The number of carbon atoms that will branch out from the compound.

    • C.

      The number of carbon atoms in total in the compound.

    • D.

      The number of compounds of MethylButane.

    Correct Answer
    A. The carbon atom on the compound from which a branch will occur.
    Explanation
    The '2' in "2-MethylButane" indicates the carbon atom on the compound from which a branch will occur. This means that there is a methyl group attached to the second carbon atom in the carbon chain of the butane molecule. The number indicates the position of the branch in the compound.

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Zohra Sattar |PhD, Chemistry |
Chemistry Expert
Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products. With her expertise, Dr. Waxali ensures the accuracy and relevance of our chemistry quizzes, contributing to a comprehensive understanding of chemical principles and advancements in the field.
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