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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- A. forms four covalent bonds and can catenate into long chains and rings
- B. readily forms ions of charge four
- C. has a very large atomic radius
- D. always forms only single bonds
Explanation: With four valence electrons and a small radius, carbon forms four strong covalent bonds and bonds to itself almost as strongly as to other…
Correct answer: forms four covalent bonds and can catenate into long chains and rings- A. has the same molecular formula
- B. differs from the next by a CH2 group and shares the same general formula and functional group
- C. has the same physical properties
- D. contains the same number of carbon atoms
Explanation: Members share a general formula and a functional group, so their chemical properties are similar, while physical properties such as…
Correct answer: differs from the next by a CH2 group and shares the same general formula and functional group- A. Benzene
- B. Cyclohexane
- C. Pyridine
- D. Naphthalene
Explanation: A heterocyclic compound has a ring containing at least one atom other than carbon, and in pyridine one of the six ring positions is…
Correct answer: Pyridine- A. the number of methyl groups present
- B. the total number of carbon atoms
- C. the position on the main chain where the methyl group is attached
- D. the number of double bonds
Explanation: The parent chain is numbered from the end that gives substituents the lowest possible locants, so the methyl group here sits on the second…
Correct answer: the position on the main chain where the methyl group is attached- A. Ethene
- B. Ethyne
- C. Benzene
- D. Ethane
Explanation: A saturated hydrocarbon contains only single carbon to carbon bonds and therefore holds the maximum possible number of hydrogen atoms…
Correct answer: Ethane- A. donates a pair of electrons
- B. accepts a pair of electrons and is attracted to electron rich centres
- C. always carries a negative charge
- D. contains an unpaired electron
Explanation: Electrophile means electron loving, so such a species is electron deficient and attacks regions of high electron density such as a double…
Correct answer: accepts a pair of electrons and is attracted to electron rich centres- A. two free radicals
- B. two neutral atoms
- C. a positive and a negative ion, because both electrons go to one atom
- D. no change in the molecule
Explanation: In heterolytic fission the shared pair leaves with the more electronegative atom, giving oppositely charged ions such as a carbocation and…
Correct answer: a positive and a negative ion, because both electrons go to one atom- A. a region of high electron density such as a double bond
- B. another nucleophile
- C. an electron deficient carbon atom, donating a lone pair to it
- D. only free radicals
Explanation: Nucleophile means nucleus loving, so these electron rich species, such as hydroxide, cyanide and ammonia, seek out carbon atoms made…
Correct answer: an electron deficient carbon atom, donating a lone pair to it- A. chemical properties
- B. functional group
- C. physical properties
- D. all of them
Explanation: Members of a homologous series have the same functional group and similar chemical properties, but successive members differ by a CH2 unit…
Correct answer: physical properties- A. 2(Divalent)
- B. 3(Trivalent)
- C. 4(Tetravalent)
- D. 1(univalent)
Explanation: Carbon has four valence electrons and usually forms four covalent bonds to complete its octet, so its valency is 4 and it is tetravalent.
Correct answer: 4(Tetravalent)- A. 14amu
- B. 12amu
- C. 18amu
- D. 22amu
Explanation: Adjacent members of a homologous series differ by one CH2 group, whose mass is 12 amu + 2 amu = 14 amu.
Correct answer: 14amu- A. Isaac Newton
- B. Antoine Lavoisier
- C. Dmitri Mendeleev
- D. Albert Einstein
Explanation: Antoine Lavoisier is commonly called the father of modern chemistry because he established careful quantitative methods, explained…
Correct answer: Antoine Lavoisier- A. it is a synthetic fertilizer
- B. it is a natural fertilizer
- C. it provides micronutrients to the plants
- D. it is an inorganic water soluble compound
Explanation: Urea is manufactured industrially from ammonia and carbon dioxide, so it is a synthetic fertilizer.
Correct answer: it is a synthetic fertilizer- A. Latin
- B. Greek
- C. Arabic
- D. None of these
Explanation: The word chemistry is derived through Arabic al-kīmiyā, but the root term is commonly traced to the Greek word khēmeia or chymeia.
Correct answer: Greek- A. Atrophy
- B. Dysplasia
- C. Metaplasia
- D. Hypertrophy
- E. Hyperplasia
Explanation: Barrett esophagus is metaplasia because the normal esophageal lining is replaced by a different, more specialized type of epithelium as an…
Correct answer: Metaplasia- A. Solution
- B. Mixtures
- C. Molecules
- D. Atoms
Explanation: Chromatography separates the components of a mixture because different substances move at different rates between a stationary phase and a…
Correct answer: Mixtures- A. Azolo
- B. Azine
- C. Azolidins
- D. Diazine
Explanation: Pyridine belongs to the azine class of six-membered aromatic nitrogen heterocycles, and “azine” is the expected name among these choices.
Correct answer: Azine- A. Pain Killer
- B. Fire Extinguisher
- C. Mosquito Repellent
- D. Petrol Additive
Explanation: Tetraethyl lead was historically mixed with petrol as an antiknock additive, increasing the fuel's octane rating and reducing engine…
Correct answer: Petrol Additive- A. Distillation
- B. Extraction
- C. Gas chromatography
- D. Column chromatography
Explanation: Column chromatography is suitable for separating a large quantity of nonvolatile organic compounds because different compounds adsorb to…
Correct answer: Column chromatography- A. CnH2nO2n
- B. CnH2n
- C. CnH2nO
- D. CnH2nOn+1
Explanation: Acyclic saturated aldehydes and ketones contain one carbonyl group and have the general formula CnH2nO.
Correct answer: CnH2nOClassification of Organic Compounds MCQs: common questions
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