Skip to content
LoginStart free

Class XI · Chemistry

Some Basic Principles of Organic Chemistry: NEET MCQ practice

241 practice questions on Some Basic Principles of Organic Chemistry, each with an explanation. Practise them chapter by chapter in the GyaanLoop app.

241

Practice questions

117

Easy

112

Medium

12

Hard

Get it on Google PlayPractise on the web →

What Some Basic Principles of Organic Chemistry covers

Topics in the NEET (UG) 2026–27 syllabus for this chapter.

  • Tetravalency of carbon, shapes of simple molecules, hybridization (s and p)
  • Classification of organic compounds based on functional groups
  • Homologous series, isomerism- structural and stereoisomerism
  • Nomenclature (trivial and IUPAC)
  • Covalent bond fission- homolytic and heterolytic, free radicals, carbocations, carbanions
  • Electronic displacement in a covalent bond- inductive effect, electromeric effect, resonance, hyperconjugation
  • Common types of organic reactions- substitution, addition, elimination, rearrangement

Sample questions on Some Basic Principles of Organic Chemistry

Try each one, then open the answer and explanation.

Question 1 · Practice question

Consider the isomeric aldehydes with molar mass 100, if all the isomers (only structural) are treated independently with NH₂OH, how many of them would give more than two stereomeric oximes?

  1. A.4
  2. B.7
  3. C.2
  4. D.3
Show answer

Answer: D. 3

This requires identifying all structural isomers of C6H12O aldehydes, then analyzing each for chiral centers to determine how many stereomeric oximes they can form with hydroxylamine. Only those with chiral centers will produce more than two stereoisomers (syn/anti oximes multiplied by chiral center possibilities). The four qualifying isomers are 2-methylpentanal, 3-methylpentanal, 2-ethylbutanal, and 2,3-dimethylbutanal, making the answer 4. The tempting wrong answers arise from undercounting isomers or misjudging chirality.

Question 2 · Practice question

The smallest acyclic ketone that gives pair of diastereomers with CH₃NH₂ in slightly acidic medium has how many carbon atoms?

  1. A.7
  2. B.6
  3. C.5
  4. D.3
Show answer

Answer: B. 6

An acyclic ketone needs a prochiral carbonyl (attached to two different groups) and an existing chiral center elsewhere to form diastereomeric imines with methylamine. The smallest such ketone is 3-methyl-2-pentanone, which has 6 carbon atoms. Option (c) 5 is wrong because in C5 ketones like 3-methyl-2-butanone, the carbon alpha to the carbonyl is not chiral due to symmetry, so no diastereomers form.

Question 3 · Practice question

Acrylonitrile is the common name of:

  1. A.CH₃CH₂CH₂CN
  2. B.CH₃CH₂CN
  3. C.CH₂=CHCN
  4. D.CH₃CN
Show answer

Answer: C. CH₂=CHCN

Acrylonitrile is the trivial name for vinyl cyanide, which has the structure CH2=CH–CN. This matches option C. Option A is butanenitrile, option B is propanenitrile, and option D is acetonitrile—none contain the C=C double bond characteristic of acrylonitrile.

Question 4 · Practice question

Ambident group among the following are:

  1. A.Cyanides and Isocyanides
  2. B.Acetone and aldehydes
  3. C.Ethers and esters
  4. D.Acetal and ketal
Show answer

Answer: A. Cyanides and Isocyanides

Ambident nucleophiles can attack through two different atoms; cyanide ion is the classic example, forming both cyanides (C-attack) and isocyanides (N-attack). Other options like acetone/aldehydes or ethers/esters are not ambident groups—they have only one reactive site for nucleophilic attack.

Question 5 · Practice question

Alkyl cyanides are isomeric with:

  1. A.Diazonium salts
  2. B.Nitroalkanes
  3. C.Ethers
  4. D.Isocyanides
Show answer

Answer: D. Isocyanides

Alkyl cyanides (R-CN) and isocyanides (R-NC) are functional isomers because they have the same molecular formula but different arrangement of atoms (the cyanide group is attached through carbon vs nitrogen). The other options have different molecular formulas or structural features, so they cannot be isomers of alkyl cyanides.

More Class XI Chemistry chapters

All Chemistry chapters →