Free Fundamental Principles of Organic Chemistry MCQs with Answers
536 Fundamental Principles of Organic Chemistry MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Organic chemistry begins with carbon compounds classified by carbon skeleton, saturation and functional group. Work includes identifying groups such as hydroxyl, carbonyl, carboxyl and amino, applying basic nomenclature, and distinguishing structural, geometric and optical isomers, where the same molecular formula does not necessarily mean the same structure or properties.
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Read the Fundamental Principles of Organic Chemistry notesFree MDCAT chapter notes with key terms536 questions · page 18 of 27
- A. 3-Methylheptane
- B. 5-Methylheptane
- C. 3-Methylhexane
- D. 2-Methylpentane
Explanation: According to the IUPAC rules of naming option A is correct.
Correct answer: 3-Methylheptane- A. 2,3,4-Trimethylpentane
- B. 2,6,6-Trimethylpentane
- C. 2,4,4-Trimethylpentane
- D. 2,2,4-Trimethylpentane
Explanation: According to this name, there are three methyl groups attached to carbon atoms, two on 2nd carbon atom and one on 4th carbon atom of the…
Correct answer: 2,2,4-Trimethylpentane- A. Derivatives
- B. Heterocyclic
- C. Poly-functional
- D. Isomers
Explanation: 1. **Functional Groups:** In organic chemistry, a functional group is a specific group of atoms or bonds within a molecule that gives the…
Correct answer: Poly-functional- A. Aromatic
- B. Heterocyclic
- C. Non-benzenoid
- D. Aliphatic
Explanation: Heterocyclic compound is the correct answer.
Correct answer: Heterocyclic- A. CH3-CH2-CHO and CH3-CO-CH3
- B. CH3-CH2-CH2-OH and CH3-CH(OH)CH3
- C. C2H5-O-C2H5 and CH3-O-C3H7
- D. CH3-COOH and HCOOCH3
Explanation: Yes, CH₃-CH₂-CH₂-OH (1-propanol) and CH₃-CH(OH)CH₃ (2-propanol or isopropanol) are examples of position isomers.
Correct answer: CH3-CH2-CH2-OH and CH3-CH(OH)CH3- A. Metamer
- B. Elastomer
- C. Enantiomer
- D. Tautomer
Explanation: Each non-superimposable mirror image structure in stereoisomerism is called an enantiomer.
Correct answer: Enantiomer- A. Methane.
- B. Butane.
- C. Propane.
- D. Ethane.
Explanation: The major portion of natural gas consists of methane (CH₄). Methane is the primary component, typically making up a significant percentage…
Correct answer: Methane.- A. 2-Butene
- B. 2-Pentene
- C. 1 -Bromo-2-chloropropene
- D. 1 -Pentene
Explanation: A, B, and C all show compounds that are capable of showing cis-trans isomerism because of having double-bonded carbons and different…
Correct answer: 1 -Pentene- A. Ethane
- B. Butane
- C. Pentane
- D. Propane
Explanation: The smallest alkane that exhibits isomerism is butane (C₄H₁₀). Butane has two structural isomers: 1.
Correct answer: Butane- A. Coal tar
- B. Petroleum
- C. Crude oil
- D. Kerosene oil
Explanation: The refined form of mineral oil is commonly known as "white oil" or "liquid paraffin" also known as petroleum.
Correct answer: Petroleum- A. 80%
- B. 50%
- C. 65%
- D. 20%
Explanation: Fractional distillation is a process used in the refining of crude oil to separate its components based on their boiling points.
Correct answer: 20%- A. Alicyclic
- B. Aromatic
- C. Acyclic compound
- D. Carbocyclic
Explanation: No, by definition, acyclic compounds are not cyclic. "Acyclic" refers to compounds that do not contain a closed-loop or ring structure.
Correct answer: Acyclic compound- A. Aromatic compounds
- B. Branched chain compounds
- C. Straight chain compounds
- D. None of these
Explanation: Isopentane is a branched chain hydrocarbon.
Correct answer: Branched chain compounds- A. Furan
- B. Pyrrole
- C. Pyridine
- D. Ethane
Explanation: Ethane is not a heterocyclic compound. It is a simple hydrocarbon composed of two carbon atoms and six hydrogen atoms, with no heteroatoms…
Correct answer: Ethane- A. 3 million
- B. Over 6 millions
- C. 6 millions
- D. 5 millions
Explanation: There are over 9 million organic compounds (natural and synthetic) present on earth.
Correct answer: Over 6 millions- A. Wohler
- B. Berzelius
- C. Faraday
- D. Bohr
Explanation: Berzelius was a Swedish scientist who in 1815 proposed that organic compounds could only be produced by some special force which must be…
Correct answer: Berzelius- A. Animals
- B. Plants
- C. Mineral
- D. Both A and B
Explanation: According to vital force theory, the organic compounds could only be produced in living organisms and could not be synthsized in…
Correct answer: Both A and B- A. Urea
- B. Methane
- C. Carbon dioxide
- D. Coal
Explanation: Apart from carbon, most of the organic compounds also contain hydrogen.
Correct answer: Carbon dioxide- A. Metamerism
- B. Chain isomerism
- C. Tautomerism
- D. Functional group isomerism
Explanation: The compounds having the same molecular formula but different functional groups are said to exhibit functional group isomerism.
Correct answer: Functional group isomerism- A. Higher the octane number, higher will be knocking
- B. Higher the octane number, efficiency of fuel will be lower
- C. Higher the octane number, lower the knocking
- D. Lower the octane number, lower the knocking
Explanation: The octane number is a measure of a fuel's resistance to knocking. As the octane number increases, the engine is less likely to produce…
Correct answer: Higher the octane number, lower the knocking