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Chemistry of Hydrocarbons MCQs for MDCAT Practice

Chemistry section, Chemistry of Hydrocarbons chapter. Up to eight free sample questions, each with the correct answer and a worked explanation. The full chapter opens in the app.

The bank has 1,545 active questions on this chapter. Your first 500 practice attempts are free, and every attempt includes a worked explanation.

  1. Question 1
    Which of the following is correct for the organic compound called halohydrine?
    • Having OH and halogen at geminal position
    • Having OH and -OR group at vicinal position
    • Having ester and ether functional group
    • Having OH and halogen at adjacent position (correct answer)
    Correct answer: D
    A halohydrin is an organic compound characterized by the presence of both a hydroxyl (-OH) group and a halogen atom on adjacent carbon atoms.
  2. Question 2
    The simplest alkene is
    • Methane
    • Ethane
    • Ethene (correct answer)
    • Propene
    Correct answer: C
    Identifies ethene as the simplest alkene, defined by the presence of at least one carbon-carbon double bond (C=CC=C).
  3. Question 3
    In addition of HCI to CH3CH=CH2, which one will be added first:
    • Cl+
    • Cl-1
    • H+ (correct answer)
    • H∘
    Correct answer: C
    Electrophilic addition to alkenes begins with protonation, forming a carbocation intermediate, as seen in HCl addition to propene.
  4. Question 4
    1,4-dimethylbenzene is called ______.
    • Ortho-xylene
    • Para-xylene (correct answer)
    • Para-methyl toluene
    • Meta-methyl toluene
    Correct answer: B
    1,4-dimethylbenzene, with methyl groups at opposite ends of the benzene ring, is correctly named para-xylene.
  5. Question 5
    IUPAC name of the compound CH3(CH2)4CH(CH3)2:
    • Octane
    • 3-methylheptane
    • 4-methylheptane
    • 2-methylheptane (correct answer)
    Correct answer: D
    Master IUPAC nomenclature for branched alkanes by identifying the longest chain and numbering to give the substituent the lowest locant.
  6. Question 6
    Which method is generally used to prepare alkynes?
    • Dehydrohalogenation of vicinal dihalide (correct answer)
    • Hydrogenation of alkene
    • Hydrolysis
    • Hydration of alkene
    Correct answer: A
    Learn the primary method for alkyne synthesis: dehydrohalogenation of vicinal dihalides, a key reaction in organic chemistry.
  7. Question 7
    Identify the smallest alkane which can form a ring structure (cycloalkane)?
    • Cyclomethane
    • Methane
    • Cyclopropane (correct answer)
    • Propane
    Correct answer: C
    Discover the smallest alkane capable of forming a ring structure, a fundamental concept in cycloalkane nomenclature and structure.
  8. Question 8
    Alkenes mostly follow the reaction of
    • Addition reaction (correct answer)
    • Elimination reaction
    • Substitution reaction
    • None of them
    Correct answer: A
    Alkenes primarily undergo addition reactions due to their pi bond, which is a site of high electron density and reactivity.

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