Free Classification of Organic Compounds MCQs with Answers
108 Classification of Organic Compounds 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 compounds are classified by carbon skeleton into open-chain, branched-chain and cyclic compounds, including homocyclic and heterocyclic types. The classification also uses functional groups to distinguish hydrocarbons, halo compounds, alcohols, aldehydes, ketones, carboxylic acids and their derivatives, which is different from naming compounds by IUPAC rules.
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108 questions · page 5 of 6
- A. Homocyclic compounds
- B. Alicyclic Compounds
- C. Heterocyclic compounds
- D. None of these options are correct
Explanation: Heterocyclic compounds are those that have at least two different elements as members of their rings.
Correct answer: Heterocyclic compounds- A. Aromatic compounds
- B. Branched chain compounds
- C. Alicyclic compounds
- D. None of these
Explanation: The IUPAC name of Isopentane is Methybutane having the formula: C5H12. Since it has one methyl group attached, which serves as a compound…
Correct answer: Branched chain compounds- A. 850,000
- B. Over 6 million
- C. 6 million
- D. 5 million
Explanation: Option B is correct as we know an estimated "20 million" different organic compounds.
Correct answer: Over 6 million- A. Heterocyclic compounds
- B. Alicyclic compounds
- C. Aliphatic compounds
- D. Carbocyclic compounds
Explanation: d) Carbocyclic compounds: Carbocyclic compounds are another term used to describe homocyclic compounds.
Correct answer: Carbocyclic compounds- A. Living things
- B. Non living things
- C. Fossils
- D. Sea water
Explanation: Organic compounds are obtained from living things. Among the numerous types of organic compounds, four major categories are found in all…
Correct answer: Living things- A. Polar solvents
- B. Water
- C. Ammonium cyanate
- D. Non-polar solvents
Explanation: Organic compounds are soluble in non-polar solvent. A non-polar solute will be dissolved by a non-polar solvent because the two are…
Correct answer: Non-polar solvents- A. Divalent
- B. Monovalent
- C. Trivalent
- D. Tetravalent
Explanation: Option A: Divalent: Divalent atoms have two valence electrons in their outermost shell, such as oxygen or sulfur.Option B: Monovalent…
Correct answer: Tetravalent- A. Living things
- B. Non-living things
- C. Fossils
- D. Sea water
Explanation: Organic compounds typically consist of groups of carbon atoms covalently bonded to hydrogen, usually oxygen, and often other elements as…
Correct answer: Living things- A. Glycol and cyclohexanol
- B. Formaldehyde and benzol
- C. Diethyl ether and ethyl alcohol
- D. Methanal and acetone
Explanation: Methanal is an aldehyde while acetone is a ketone. Both compounds have a similar structure as they contain a carbonyl group.
Correct answer: Methanal and acetone- A. Amino acids
- B. Ammonium carbonate
- C. Ammonium cyanate
- D. Xanthin
Explanation: Friedrich Wöhler prepared urea from ammonium cyanate, an inorganic compound.
Correct answer: Ammonium cyanate- A. Alicyclic
- B. Aromatic
- C. Acyclic compounds
- D. Carbocyclic compounds
Explanation: Here are the definitions of each of the above terms: Alicyclic: contains one or more all-carbon rings which may be saturated or…
Correct answer: Acyclic compounds- A. 1900
- B. 1829
- C. 1850
- D. 1828
Explanation: In 1828, Wohler synthesized urea by slowly evaporating a water solution of ammonium cyanate, which he had prepared by adding silver…
Correct answer: 1828- A. Class
- B. Group
- C. Homologous series
- D. None of these options is correct
Explanation: The compounds which belong to the same functional group form a homologous series.
Correct answer: Homologous series- A. Urea
- B. Methane
- C. Carbon dioxide
- D. Coal
Explanation: Organic compounds of carbon are classified as organic when carbon is bound to hydrogen.
Correct answer: Carbon dioxide- A. Closed chain hydrocarbons
- B. Open chain hydrocarbons
- C. Ring compounds
- D. Alicyclic compounds
Explanation: Acyclic are open-chain hydrocarbons while cyclic compounds are closed-chained compounds.
Correct answer: Open chain hydrocarbons- A. Acid number
- B. Iodine number
- C. Saponification number
- D. None of these
Explanation: Iodine value, also called Iodine Number, in analytical chemistry, a measure of the degree of unsaturation of oil, fat, or wax; the amount…
Correct answer: Iodine number- A. Condensation
- B. Polymerization
- C. Cyclization
- D. Catenation
Explanation: Catenation is the ability of an element to bond with itself to form long chains or rings.
Correct answer: Catenation- A. Multiple bonds
- B. Hybridization
- C. Long chain or rings of carbon atoms
- D. Showing isomerism
Explanation: Catenation is the bonding of atoms of the same element into a series, called a chain.
Correct answer: Long chain or rings of carbon atoms- A. Aniline
- B. Pyridine
- C. Hydrazine
- D. Naphthalene
Explanation: Option D is correct as it is an aromatic hydrocarbon containing two fused benzene rings with the formula C10H8 hence it does not contain…
Correct answer: Naphthalene- A. CaCO3
- B. CAC2
- C. KCN
- D. (NH2)CO
Explanation: (NH2)CO (urea): This compound is organic as it contains carbon-hydrogen (C-H) bonds and is commonly found in biological systems.
Correct answer: (NH2)CO