Organic Chemistry Practice Questions! Trivia Test

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Organic Chemistry Practice Questions! Trivia Test - Quiz

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Questions and Answers
  • 1. 

    What is the name of the organic compound below

    • A.

      3,3-dipropyloctane

    • B.

      3,5-dipropylhexane

    • C.

      3-propyl-5-methyloctane

    • D.

      4-ethyl-6-methylnonane

    Correct Answer
    D. 4-ethyl-6-methylnonane
    Explanation
    The compound is named as "4-ethyl-6-methylnonane". It describes a nonane molecule, because the longest chain is 9 carbons long, with an ethyl group attached to the fourth carbon atom and a methyl group attached to the sixth carbon atom along the main carbon chain. 

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  • 2. 

    Name the organic compound below

    • A.

      3,4-diethyl-2-hexene

    • B.

      3,4-ethylhexene

    • C.

      3,4-diethylhexene

    • D.

      3,4-diethyl-4-hexene

    Correct Answer
    A. 3,4-diethyl-2-hexene
    Explanation
    The correct answer is 3,4-diethyl-2-hexene because the compound has two ethyl groups (diethyl) attached to the 3rd and 4th carbon atoms of a hexene chain, and the double bond is located between the 2nd and 3rd carbon atoms (2-hexene).

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  • 3. 

    Which of the following structures is a ketone?

    • A.

      Structure:

    • B.

      Structure:

    • C.

      Structure:

    • D.

      Structure

    Correct Answer
    A. Structure:
  • 4. 

    Which of the following functional groups contain a carboxyl group?

    • A.

      Esters

    • B.

      Ethers

    • C.

      Carboxylic acids

    • D.

      Aldehydes

    Correct Answer
    C. Carboxylic acids
    Explanation
    Carboxylic acids contain a carboxyl group, which is composed of a carbonyl group (C=O) and a hydroxyl group (-OH) attached to the same carbon atom. This functional group is responsible for the acidic properties of carboxylic acids, as well as their ability to form hydrogen bonds and participate in various chemical reactions. Esters, ethers, and aldehydes do not contain a carboxyl group; instead, they have different functional groups with distinct chemical properties.

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  • 5. 

    Which of the following shows a condensation reaction?

    • A.

      Reaction:

    • B.

      Reaction:

    • C.

      Reaction:

    • D.

      Reaction:

    Correct Answer
    A. Reaction:
  • 6. 

    What happens to boiling point and melting point of an organic compound when it exhibits chain branching?

    • A.

      Boiling point increases while melting point decreases

    • B.

       boiling point decreases while melting point increases

    • C.

      Both boiling point and melting point decreases

    • D.

      Both boiling point and melting point increases

    Correct Answer
    B.  boiling point decreases while melting point increases
    Explanation
    Boiling Point: Chain branching in organic compounds generally leads to a decrease in boiling point. This is because branched-chain molecules have a more compact structure and lower surface area compared to their straight-chain counterparts, resulting in weaker intermolecular forces (van der Waals forces) and, consequently, lower boiling points.
    Melting Point: The melting point of branched-chain compounds can be higher than that of their straight-chain counterparts. This is because the compact and often more symmetrical structure of branched molecules can pack more efficiently in the solid state, leading to stronger intermolecular interactions in the solid phase and a higher melting point.

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  • 7. 

    Which of the following is a saturated hydrocarbon?

    • A.

      Structure:

    • B.

      Structure:

    • C.

      Structure:

    • D.

      Structure:

    Correct Answer
    A. Structure:
  • 8. 

    An alkyne with 6 carbons will have how many hydrogen atoms?

    • A.

      10

    • B.

      12

    • C.

      14

    • D.

      13

    Correct Answer
    A. 10
    Explanation
    An alkyne with 6 carbons will have 2 hydrogen atoms bonded to each carbon atom, except for the two end carbon atoms which will have 1 hydrogen atom bonded to each. Therefore, the total number of hydrogen atoms in the alkyne will be 2(6) + 1 + 1 = 13.

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  • 9. 

    -dienes are the name given to compounds with

    • A.

      Exactly one double bond

    • B.

      Exactly one triple bond

    • C.

      Exactly two double bond

    • D.

      More than two double bonds

    Correct Answer
    C. Exactly two double bond
    Explanation
    The correct answer is "exactly two double bonds." The name "dienes" refers to compounds that have exactly two double bonds. This means that there are two carbon-carbon double bonds present in the molecule. It is important to note that if there is only one double bond, the compound would be called a "ene" rather than a "diene." Similarly, if there are more than two double bonds, the compound would have a different name.

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  • 10. 

    Organic compounds in which two hydrocarbon groups are bonded to the same atom of oxygen.

    • A.

      Ether

    • B.

      Alcohol

    • C.

      Ester

    • D.

      Aldehyde

    Correct Answer
    A. Ether
    Explanation
    Ether is the correct answer because it is an organic compound in which two hydrocarbon groups are bonded to the same atom of oxygen. Ethers have the general formula R-O-R', where R and R' represent hydrocarbon groups. They are commonly used as solvents and anesthetics due to their low reactivity and volatility.

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  • Current Version
  • May 25, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 05, 2020
    Quiz Created by
    Brian
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