Hydrocarbons: Alkanes, Alkenes, Alkynes - Competitive Exam Level

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This section is designed to prepare students for high-frequency and high-difficulty questions on hydrocarbons asked in competitive examinations. The focus is on accuracy, speed, and conceptual clarity, enabling students to handle tricky reaction-based and mechanism-driven problems.

In this section, you will practice:

  • Rapid identification and classification of hydrocarbons

  • Reaction prediction for alkanes, alkenes, and alkynes

  • Comparative reactivity and stability-based questions

  • Markovnikov vs. anti-Markovnikov addition problems

  • Isomerism-based and structure-identification questions

  • Multi-step reaction sequence and product analysis

  • Assertion–reason, match-the-following, and integer-type MCQs

  • Previous-year and NCERT-based competitive exam questions

The content is structured to improve exam temperament, strengthen elimination strategies, and minimize common mistakes under time pressure.

Mastering hydrocarbons at the competitive exam level ensures confidence and accuracy in the organic chemistry sections of JEE, NEET, and other national-level tests.

Q. What is the major product of the hydration of propene in the presence of sulfuric acid?
  • A. Propan-1-ol
  • B. Propan-2-ol
  • C. Propanoic acid
  • D. Propyl sulfate
Q. What is the molecular formula of 2,3-dimethylbutane?
  • A. C7H16
  • B. C6H14
  • C. C8H18
  • D. C5H12
Q. What is the molecular formula of 2-butyne?
  • A. C4H6
  • B. C4H8
  • C. C4H10
  • D. C4H4
Q. Which of the following compounds is a functional group of alkenes?
  • A. -OH
  • B. -COOH
  • C. -C=C-
  • D. -C≡C-
Q. Which of the following compounds is a structural isomer of butane?
  • A. 2-methylpropane
  • B. 1-butene
  • C. Cyclobutane
  • D. Pentane
Q. Which of the following is a characteristic of alkynes?
  • A. Contain only single bonds
  • B. Contain at least one triple bond
  • C. Are saturated hydrocarbons
  • D. Are cyclic compounds
Q. Which of the following is the correct representation of cis-2-butene?
  • A. CH3-CH=CH-CH3
  • B. CH3-CH=CH-CH2
  • C. CH3-CH=CH-CH3
  • D. CH3-CH2-CH=CH2
Q. Which of the following is the correct structure for 1-hexene?
  • A. CH2=CH-CH2-CH2-CH2-CH3
  • B. CH3-CH2-CH2-CH=CH-CH3
  • C. CH3-CH=CH-CH2-CH2-CH3
  • D. CH3-CH2-CH=CH-CH2-CH3
Q. Which reaction mechanism is involved in the hydration of alkenes?
  • A. Electrophilic addition
  • B. Nucleophilic substitution
  • C. Free radical substitution
  • D. Elimination
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