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 5 of 27
- A. They are usually volatile liquids
- B. Show weak hydrogen bonding
- C. They are highly flammable with low boiling points
- D. It is poisonous and is used as a disinfectant in hospitals
Explanation: Ethers are generally volatile liquids with low boiling points because they cannot form strong intermolecular hydrogen bonds.
Correct answer: It is poisonous and is used as a disinfectant in hospitals- A. 2-Ethanoic acid
- B. 2-Ethanoate
- C. Diethyl ether
- D. 2-Diethanol
Explanation: Diethyl ether is a colorless, volatile, and highly flammable liquid that is commonly used as a solvent in organic chemistry.
Correct answer: Diethyl ether- A. Ethers
- B. Aldehydes
- C. Ketones
- D. Esters
Explanation: Ethers do not contain a double bond in their functional group. The functional group of ether is an oxygen atom that is bonded to two alkyl…
Correct answer: Ethers- A. Cis Trans isomers
- B. Chain isomers
- C. Position isomers
- D. Metamers
Explanation: Option A is correct as when the substituent groups are oriented in the same direction, the diastereomer is referred to as cis, whereas…
Correct answer: Cis Trans isomers- A. Acyclic compound
- B. Alicyclic compound
- C. Heterocyclic compound
- D. Aromatic compound
Explanation: The homocyclic compounds which contain a ring of three or more carbon atoms and resembling aliphatic compounds are called alicyclic…
Correct answer: Alicyclic compound- A. Alicyclic and aromatic
- B. Carbocyclic and heterocyclic
- C. Acyclic and heterocyclic
- D. Heterocyclic and aromatic
Explanation: Homocyclic compounds are divided into two compounds. Alicyclic compounds and aromatic compounds.
Correct answer: Alicyclic and aromatic- A. Fats
- B. Water
- C. Carbohydrates
- D. None
Explanation: Water does not comply by the following definition: Organic compound, any of a large class of chemical compounds in which one or more atoms…
Correct answer: Water- A. Pairing scheme should be same
- B. Arrangement of atoms should be same
- C. Energy should be same
- D. All are true
Explanation: The following are the characteristics of a resonance structure. The same number of paired and unpaired electrons i.e.
Correct answer: All are true- A. Aliphatic
- B. Aromatic
- C. Benzene
- D. Heterocyclic
Explanation: Alicyclic compounds are compounds that are both aliphatic and cyclic. They contain one or more all-carbon rings which may be either…
Correct answer: Aliphatic- A. Thiophene
- B. Anthracene
- C. Furan
- D. Pyrrole
Explanation: Anthracene is a Polycyclic Aromatic Hydrocarbon (PAH) with the formula C14H10.
Correct answer: Anthracene- A. Acyclic compounds
- B. Alicyclic compounds
- C. Ring compounds
- D. Closed chain compounds
Explanation: Option A is correct because aliphatic compounds are a class of organic compounds that contain carbon atoms arranged in straight chains…
Correct answer: Acyclic compounds- A. CnH2n
- B. CnH2n-2
- C. CnH2n+2
- D. None of these
Explanation: CnH2n+2 is valid only in case of saturated open chain hydrocarbons, not in case of alicyclic. So this is correct answer.
Correct answer: CnH2n+2- A. Carbocyclic
- B. Aromatic
- C. Alicyclic
- D. Both A and C
Explanation: Cyclohexane is carbocyclic because its ring is composed solely of carbon atoms.
Correct answer: Both A and C- A. 1
- B. 3
- C. 2
- D. 0
Explanation: Secondary carbon atoms are those which are further attatched with 2 other carbon atoms or 2 hydrogen atoms.
Correct answer: 2- A. Straight chain and cyclic
- B. Branched chain and alicyclic
- C. Straight chain and branched
- D. Homocyclic and alicyclic
Explanation: Aliphatic or open chain compounds are further classified as straight chain and branched compounds.
Correct answer: Straight chain and branched- A. Sulphur
- B. Nitrogen
- C. Oxygen
- D. Chlorine
Explanation: Heteroatoms in a cyclic structure must be able to form at least two covalent bonds to be part of the ring.
Correct answer: Chlorine- A. Cyclobutane
- B. Iso-butane
- C. n-Butane
- D. Toluene
Explanation: A. Alicyclic, B. Branched hydrocarbon, C. Straight chain hydrocarbon and D. Aromatic compound.
Correct answer: Cyclobutane- A. Ammonium cyanate
- B. Urea
- C. Methane
- D. Benzene
Explanation: In 1828, Friedrich Wohler synthesized urea by heating the inorganic compound ammonium cyanate.
Correct answer: Urea- A. Homocyclic compound
- B. Heterocyclic compound
- C. Carbocyclic compound
- D. Aliphatic compound
Explanation: Pyridine is classified as a heterocyclic compound because it contains a ring made of atoms of different elements, particularly nitrogen.
Correct answer: Heterocyclic compound- A. 4
- B. 5
- C. 3
- D. 6
Explanation: Living organisms are primarily composed of four major classes of large biological macromolecules, which are all organic compounds…
Correct answer: 4