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 17 of 27
- A. 2-Pentanone
- B. Phenol
- C. 2-Butene
- D. Lactic acid
Explanation: A Reaction which involves simple proton transfer in an intramoleculer fashion is called tautomerism.Hence lactic acid,phenol,2-pentanone…
Correct answer: 2-Butene- A. 3
- B. 4
- C. 5
- D. 6
Explanation: The minimum 5 carbon atoms are required to show metamerism in ketones.
Correct answer: 5- A. 1,1-Diphenyl-1-butene
- B. 1,1-Diphenyl-2-butene
- C. 2,3-Dimethyl-2-butene
- D. 3-Phenyl-1-butene
Explanation: Geometric isomerism are commonly observed in C-C double bonds.C-C double bonded compounds have restricted rotation.
Correct answer: 1,1-Diphenyl-2-butene- A. 2
- B. 3
- C. 4
- D. 5
Explanation: The number of structural isomers possible for the molecular formula C3H9N is 4.
Correct answer: 4- A. 2
- B. 3
- C. 4
- D. 5
Explanation: In an alkane chain, at least 4C atoms are required to show chain isomerism.Isomers with different carbon skeleton (parent chain or side…
Correct answer: 4- A. Molecular formula
- B. Structure formula
- C. Physical formula
- D. Chemical formula
Explanation: A similarity which is necessary for isomerism is that they must have the same molecular formula,but have a different arrangement of the…
Correct answer: Molecular formula- A. Meso form is optically inactive due to external compensation
- B. The molecules of the meso isomers are chiral
- C. It can be separated into optically active enantiometric pairs
- D. It is a single compound
Explanation: Meso form of isomers are single compounds and their molecules are archiral hence they cannot be separated into pairs.A meso compound or…
Correct answer: It is a single compound- A. They differ in both physical and chemical properties
- B. They have the different molecular formula
- C. There are two types of Isomerism : Structural and Stereo Isomerism
- D. Geometric and optical isomerism are two types of Stereo Isomerism
Explanation: Two or more compounds having the same moleculer formula but different structural formulas and properties are said to be isomers and the…
Correct answer: They have the different molecular formula- A. ClHC = CHCI
- B. H3C − HC = CHCH3
- C. H2C = CHCl
- D. BrClC = CClBr
Explanation: Vinyl chloride is an organochloride with the formula H2C = CHCl.It is also called vinyl chloride monomer or chloroethane.This colorless…
Correct answer: H2C = CHCl- A. Position isomerism
- B. Metamerism
- C. Functional group isomerism
- D. Chain isomerism
Explanation: Functional isomers have same moleculer formula but different functional group.
Correct answer: Functional group isomerism- A. Dimethyl ether
- B. Diethyl ether
- C. Ethylene glycol
- D. Methanol
Explanation: Dimethyl ether is an isomer of ethanol. Sometimes there is more than one way to connect a given group of atoms into a moleculer…
Correct answer: Dimethyl ether- A. Acetaldehyde
- B. Ethane
- C. Cyclopropane
- D. Isobutane
Explanation: The homocyclic compounds which contain a ring of three or more carbon atoms and resembling aliphatic compounds are called alicyclic…
Correct answer: Cyclopropane- A. 3-Ethyl-3-isopropyl hexane
- B. Isopropylhexane
- C. 4-Ethyl-5-methylhexane
- D. 3-Methylhexane
Explanation: Correct answer is 3-Ethyl-3isopropyl hexane.
Correct answer: 3-Ethyl-3-isopropyl hexane- A. 2
- B. 3
- C. 4
- D. 5
Explanation: The correct answer is 4. To determine the number of possible esters, we must consider different ways to arrange a four-carbon skeleton and…
Correct answer: 4- A. Functional group isomerism
- B. Tautomerism
- C. Metamerism
- D. Cis-trans isomerism
Explanation: The shifting of proton within the molecule is called tautomerism.
Correct answer: Tautomerism- A. Naphthalene
- B. Pyrene
- C. Anthracene
- D. Biphenyl methane
Explanation: Aromatic compounds usually have some common name to identify them easily.
Correct answer: Anthracene- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: 1-butene is straight chain hydrocarbon. So, A is correct. Cyclohexene is alicylic hydorcarbon.
Correct answer: Option D- A. Isomerism.
- B. Complexity of structure.
- C. Catenation.
- D. Homologous series.
Explanation: Catenation is the ability of atoms of a particular element, especially carbon, to form long chains or rings by bonding to each other.
Correct answer: Catenation.- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The isobutyl radical is derived from isobutane (2-methylpropane) by removing one hydrogen atom.
Correct answer: Option C- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Option A shows tertiary radical, tertiary radicals (radicals on a carbon atom that is directly bonded to three other carbon atoms) are…
Correct answer: Option A