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 6 of 27
- A. Heterocyclic compounds
- B. Carbocyclic compounds
- C. Saturated compounds
- D. Aromatic compounds
Explanation: An alicyclic compound is defined as an organic compound, which is both cyclic and aliphatic.
Correct answer: Carbocyclic compounds- A. Aromatic
- B. Heterocyclic
- C. Non-benzenoid
- D. Aliphatic
Explanation: Heterocyclic compounds are cyclic compounds in which one or more of the ring atoms are elements other than carbon.
Correct answer: Heterocyclic- A. Saturated
- B. Unsaturated
- C. Alkenes
- D. Alkynes
Explanation: A saturated organic compound is one in which all the carbon atoms are bonded to the maximum possible number of other atoms (four) via…
Correct answer: Saturated- A. Benzene and acetone
- B. Benzene and CS2
- C. Ethyl acetate and CS2
- D. Acetone and ethyl acetate
Explanation: Ketonic group is present in camphor and methone which is used in cosmetics and fragrances.Hence, acetone is used in nail polish remover…
Correct answer: Acetone and ethyl acetate- A. Homologous series
- B. Functional group
- C. Chemical bonding
- D. Ionic complex
Explanation: Functional group is a group of atoms responsible for the characteristic reactions of a particular compound.
Correct answer: Functional group- A. -COOH
- B. -OH
- C. -CONH2
- D. -CHO
Explanation: The functional group that defines a carboxylic acid is the carboxyl group.
Correct answer: -COOH- A. 2-phenyl ethanamine
- B. 2-phenyl ethanamide
- C. 2-phenyl ethenamine
- D. 3-phenyl ethanamine
Explanation: The compound C6H5−CH2−CH2−NH2 is an amine. The parent hydrocarbon is ethane.
Correct answer: 2-phenyl ethanamine- A. R-O-R'
- B. (Cn + H2n+1) CO
- C. CnH2n+1CHO
- D. (Cn H2n+1 COOCn H2n+1)
Explanation: The correct answer is Option A: R-O-R'. Ethers are characterized by an oxygen atom bonded to two alkyl or aryl groups, symbolized by R and…
Correct answer: R-O-R'- A. -SH
- B. -COOH
- C. -CN
- D. -COOR
Explanation: The name "cyano" comes from the Greek word "κυανος," which means "dark blue." This is because cyanides, which are compounds that contain…
Correct answer: -CN- A. A
- B. B
- C. C
- D. D
Explanation: This compound is 3-hexene. It shows geometrical iomerism as it contains two different groups attached to the carbons of double bond on…
Correct answer: B- A. Chain isomerism & Position isomerism
- B. Chain isomerism & Functional group isomerism
- C. Chain isomerism, Position isomerism & Functional group isomerism
- D. Position isomerism, Functional group isomerism & Metamerism
Explanation: 1-Butanol (n-butanol or butyl alcohol) exhibits several types of isomerism:Chain Isomerism: As mentioned earlier, 1-butanol is a…
Correct answer: Chain isomerism, Position isomerism & Functional group isomerism- A. Lactic acid
- B. Acetic acid
- C. 1-Butene
- D. 2-Butene
Explanation: 2-Butene does exhibit geometrical isomerism. It has a double bond between the second and third carbon atoms, and the different spatial…
Correct answer: 2-Butene- A. Two
- B. One
- C. Three
- D. Four
Explanation: Lactic acid, with the chemical formula CH3CH(OH)COOH, contains one chiral center.
Correct answer: One- A. Position isomers
- B. Functional group isomers
- C. Chain isomers
- D. Tautomers
Explanation: Isomers are of two kinds: structural isomers and stereo-isomers. (We have to consider structural isomers only for this question because we…
Correct answer: Functional group isomers- A. Tautomers
- B. Functional
- C. Position
- D. Metamers
Explanation: They are functional isomers due to the fact that they have the same molecular composition but different functional groups with valeric…
Correct answer: Functional- A. 2
- B. 3
- C. 4
- D. 6
Explanation: The compound having the molecular formula C3H7Cl will have two different structural isomers which are 1-chloropropane and 2-chloropropane.
Correct answer: 2- A. Dextrorotatory
- B. Levorotatory
- C. Presence of an asymmetric carbon
- D. Molecular dysymmetry
Explanation: Necessary conditions for optical activity:The compound must contain an asymmetrical carbon atom.The molecule must contain a chiral…
Correct answer: Presence of an asymmetric carbon- A. Functional isomers
- B. Position isomers
- C. Chain isomers
- D. Metamers
Explanation: Metamerism isomerism is due to the unequal distribution of carbon atoms on either side of the functional group.
Correct answer: Metamers- A. Metamerism
- B. Functional group isomerism
- C. Position isomerism
- D. Chain isomerism
Explanation: Functional group isomerism is the correct answer because it refers to isomers that have the same molecular formula but differ in…
Correct answer: Functional group isomerism- A. Position isomerism
- B. Tautomerism
- C. Metamerism
- D. Cis-trans isomerism
Explanation: Metamerism is a type of structural isomerism where isomers have the same functional group but differ in the arrangement of alkyl groups…
Correct answer: Metamerism