Hydrocarbons: Alkanes, Alkenes, Alkynes - Higher Difficulty Problems

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This section presents conceptually demanding and multi-step problems that test a deep understanding of the chemistry of alkanes, alkenes, and alkynes. It is designed for advanced learners who aim to master complex reaction logic, selectivity, and mechanistic reasoning.

In this section, you will solve:

  • Multi-step reaction sequence problems involving hydrocarbons

  • Problems based on competing substitution, addition, and elimination reactions

  • Stability-based questions involving carbocations, radicals, and intermediates

  • Tricky regioselectivity and stereoselectivity scenarios

  • Structure determination from reaction outcomes

  • Combined problems linking hydrocarbons with isomerism and mechanisms

  • High-level exam and previous-year challenge problems

The problems are structured to strengthen analytical depth, enhance mechanistic clarity, and improve the ability to handle time-intensive, high-order questions.

Mastering this section ensures readiness for the toughest hydrocarbon problems encountered in competitive exams and undergraduate assessments.

Q. What is the expected product when 1-butyne undergoes hydroboration-oxidation?
  • A. 1-butanol
  • B. 2-butanol
  • C. butanal
  • D. butyric acid
Q. What is the IUPAC name for the compound CH3-CH2-CH(CH3)-C≡C-CH2-CH3?
  • A. 3-heptyne
  • B. 2-heptyne
  • C. 4-heptyne
  • D. 1-heptyne
Q. What is the IUPAC name for the compound with the formula C6H10 that contains a double bond?
  • A. 1-hexene
  • B. 2-hexene
  • C. cyclohexene
  • D. 3-hexene
Q. What is the major product of the reaction of 1-butyne with HBr?
  • A. 1-bromobutane
  • B. 2-bromobutane
  • C. butane
  • D. bromobenzene
Q. What is the product of the complete combustion of ethyne (acetylene)?
  • A. CO2 and H2O
  • B. C and H2O
  • C. CO and H2O
  • D. C2H4
Q. What is the product of the hydrogenation of 2-pentyne?
  • A. pentane
  • B. 2-pentene
  • C. 1-pentene
  • D. 3-pentene
Q. Which of the following is the correct IUPAC name for 3-methyl-1-pentyne?
  • A. 3-methyl-1-pentyne
  • B. 2-methyl-1-pentyne
  • C. 1-methyl-3-pentyne
  • D. 1-methyl-2-pentyne
Q. Which of the following is the correct mechanism for the hydration of an alkene?
  • A. Electrophilic addition
  • B. Nucleophilic substitution
  • C. Radical substitution
  • D. Elimination
Q. Which of the following is the correct stereochemical configuration for 2-butene?
  • A. cis
  • B. trans
  • C. both cis and trans
  • D. neither cis nor trans
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