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Organic Chemistry — Some Basic Principles and Techniques JENPAS MCQ & Practice Questions

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  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
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  • Error review and targeted revision

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Top 20 Organic Chemistry — Some Basic Principles and Techniques MCQs with Answers

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JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

1. Organic chemistry primarily deals with compounds of:

  • A. Calcium
  • B. Helium
  • C. Carbon
  • D. Sodium
Answer: C
Explanation: Organic chemistry mainly concerns carbon compounds, especially those containing C-H frameworks.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

2. Carbon shows exceptional catenation mainly because of:

  • A. Absence of p orbitals
  • B. Strong C-C bonds and small atomic size
  • C. Very large atomic size
  • D. Low valency
Answer: B
Explanation: Small carbon atoms form strong covalent C-C bonds.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

3. The tetravalency of carbon arises because carbon commonly forms:

  • A. Four covalent bonds
  • B. Two covalent bonds only
  • C. Six covalent bonds
  • D. One ionic bond
Answer: A
Explanation: Carbon has four valence electrons and commonly forms four covalent bonds.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

4. The hybridisation of carbon in methane is:

  • A. sp2
  • B. sp
  • C. dsp2
  • D. sp3
Answer: D
Explanation: Four sigma bonds around carbon correspond to sp3 hybridisation.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

5. The hybridisation of carbon in ethene is:

  • A. sp
  • B. d2sp3
  • C. sp2
  • D. sp3
Answer: C
Explanation: Each carbon in ethene is trigonal planar and sp2 hybridised.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

6. The hybridisation of carbon in ethyne is:

  • A. sp3d
  • B. sp
  • C. sp2
  • D. sp3
Answer: B
Explanation: Each carbon in ethyne is linear and sp hybridised.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

7. A carbon-carbon single bond contains:

  • A. One sigma bond
  • B. One pi bond
  • C. Two sigma bonds
  • D. One sigma and one pi bond
Answer: A
Explanation: Single bonds are sigma bonds.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

8. A carbon-carbon double bond contains:

  • A. Two sigma bonds
  • B. Two pi bonds
  • C. One pi bond only
  • D. One sigma and one pi bond
Answer: D
Explanation: A double bond consists of one sigma and one pi bond.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

9. A carbon-carbon triple bond contains:

  • A. Two sigma and one pi bond
  • B. Three pi bonds
  • C. One sigma and two pi bonds
  • D. Three sigma bonds
Answer: C
Explanation: A triple bond has one sigma and two pi bonds.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

10. The IUPAC name of CH3CH2CH3 is:

  • A. Propene
  • B. Propane
  • C. Ethane
  • D. Butane
Answer: B
Explanation: A three-carbon saturated chain is propane.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

11. The IUPAC name of CH3CH2OH is:

  • A. Ethanol
  • B. Methanol
  • C. Ethanal
  • D. Ethanoic acid
Answer: A
Explanation: Two carbons with an -OH group gives ethanol.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

12. The IUPAC name of CH3CHO is:

  • A. Ethanol
  • B. Ethanone
  • C. Methanal
  • D. Ethanal
Answer: D
Explanation: The two-carbon aldehyde is ethanal.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

13. The IUPAC name of CH3COCH3 is:

  • A. Propanol
  • B. Ethanal
  • C. Propanone
  • D. Propanal
Answer: C
Explanation: A three-carbon ketone is propanone.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

14. The IUPAC name of CH3CH2COOH is:

  • A. Propanone
  • B. Propanoic acid
  • C. Ethanoic acid
  • D. Propanal
Answer: B
Explanation: A three-carbon carboxylic acid is propanoic acid.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

15. Chain isomerism arises from differences in:

  • A. Carbon skeleton
  • B. Functional group only
  • C. Spatial arrangement only
  • D. Molecular formula
Answer: A
Explanation: Chain isomers have different carbon skeletons.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

16. Position isomerism involves different positions of:

  • A. The molecular formula
  • B. The total carbon count
  • C. Isotopes only
  • D. A functional group, substituent or multiple bond
Answer: D
Explanation: The same skeleton/function occurs at different positions.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

17. Functional isomers have the same molecular formula but:

  • A. Different isotopes only
  • B. Different numbers of carbon atoms
  • C. Different functional groups
  • D. Identical structures
Answer: C
Explanation: Functional isomerism changes the functional group while retaining formula.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

18. Metamerism is commonly associated with compounds containing:

  • A. Only alcohols
  • B. A polyvalent functional group such as ether
  • C. Only alkanes
  • D. Only alkenes
Answer: B
Explanation: Different alkyl groups on either side of a polyvalent atom/group give metamers.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

19. Geometrical isomerism in alkenes is mainly due to:

  • A. Restricted rotation about C=C bond
  • B. Free rotation about C-C bond
  • C. Ionic bonding
  • D. Hydrogen bonding
Answer: A
Explanation: The pi bond prevents free rotation.

JENPAS Chemistry · Organic Chemistry — Some Basic Principles and Techniques · Very Very Hard

20. Optical isomerism commonly arises from:

  • A. Only a double bond
  • B. Aromaticity alone
  • C. Ionic bonding
  • D. Chirality
Answer: D
Explanation: Chiral molecules can exist as non-superimposable mirror images.

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Organic Chemistry — Some Basic Principles and Techniques Practice Tests

Organic Chemistry — Some Basic Principles and Techniques Frequently Asked Questions

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