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Organic Chemistry Some Basic Principles and Techniques — NEET & JEE Chemistry MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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Sample questions from this chapter

Which experiment decisively weakened the vital-force theory of organic compounds?
  1. Wöhler synthesised urea from ammonium cyanate ✓
  2. Lavoisier burned carbon compounds in oxygen
  3. Kekulé proposed a ring structure for benzene
  4. Berzelius separated compounds from living tissue
Answer: A. Wöhler's laboratory conversion of inorganic ammonium cyanate into urea showed that an organic compound need not arise from a living organism. That directly attacked vitalism.
Why not B: Combustion analysis established composition but did not make an organic compound from an inorganic source.
Why not C: The benzene proposal concerned structure, not the claimed need for a life force.
Why not D: Berzelius supported the vital-force distinction rather than disproving it.
Which order describes simple alkyl-carbocation stability?
  1. CH3+ > 1° > 2° > 3°
  2. 1° > 2° > 3° > CH3+
  3. 3° > 2° > 1° > CH3+ ✓
  4. 2° > 3° > 1° > CH3+
Answer: C. Alkyl groups stabilise positive carbon through +I effect and hyperconjugation, so more substitution gives 3° > 2° > 1° > methyl. Applying steric crowding here gives the wrong intuition.
Why not A: This reverses stabilisation by alkyl substitution and hyperconjugation.
Why not B: This recognises methyl as least stable but reverses the order among substituted cations.
Why not D: A tertiary cation has more donating alkyl groups and hyperconjugative structures than a secondary one.
What is the correct IUPAC name of CH3CH(CH3)CH2CH(OH)CH3?
  1. 4-methylpentan-2-ol ✓
  2. 2-methylpentan-4-ol
  3. 1,3-dimethylbutan-1-ol
  4. 4-methylpentan-4-ol
Answer: A. The longest OH-containing chain has five carbons and is numbered from the OH end, giving OH at 2 and methyl at 4: 4-methylpentan-2-ol. Suffix priority controls direction.
Why not B: This numbers from the end nearer the methyl branch and gives the suffix OH the higher locant 4.
Why not C: Choosing a four-carbon parent ignores the longest chain containing the OH carbon.
Why not D: It assigns the OH locant from the methyl position rather than the actual structure.

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Every NCERT question in this chapter is solved, free: NCERT solutions — Organic Chemistry Some Basic Principles and Techniques →

Other NEET Chemistry chapters

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Questions

How many NEET and JEE questions are there on Organic Chemistry Some Basic Principles and Techniques?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET and JEE Chemistry chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.