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.
Last updated
Read the Fundamental Principles of Organic Chemistry notesFree MDCAT chapter notes with key terms536 questions · page 12 of 27
- A. Imides
- B. Amines
- C. Amides
- D. Carboxylic acid
Explanation: Amides are derived from carboxylic acids by replacing the -OH group with an amino group (-NH2).
Correct answer: Amides- A. sp3 hybridized
- B. sp2 hybridized
- C. sp hybridized
- D. unhybridized
Explanation: In ethane, each carbon atom is sp3 hybridized. This means that each carbon atom has four hybrid orbitals formed by the combination of one…
Correct answer: sp3 hybridized- A. sp
- B. sp2
- C. sp3
- D. dsp
Explanation: This is correct because sp2 hybridization involves one s orbital and two p orbitals, allowing for the formation of three sigma bonds and…
Correct answer: sp2- A. Oscillation of H atoms between two polyvalent carbon atoms
- B. Optical rotation due to multiple bonds
- C. Free rotation about C=C bond
- D. Restricted rotation about C=C bond
Explanation: Geometric isomerism in alkenes arises due to the restricted rotation around the carbon-carbon double bond.
Correct answer: Restricted rotation about C=C bond- A. Amines
- B. Ethers
- C. Neither a nor b
- D. Both a and b
Explanation: Ethers can exhibit metamerism because they have the general formula R-O-R'.
Correct answer: Ethers- A. Metamers
- B. Functional group isomers
- C. Position isomers
- D. cis-trans isomers
Explanation: Dimethyl ether and ethyl alcohol are functional group isomers because they have the same molecular formula (C2H6O) but different…
Correct answer: Functional group isomers- A. Aromatization
- B. Polymerization
- C. Association
- D. Catenation
Explanation: Catenation refers to the ability of atoms of certain elements, particularly carbon, to form bonds with other atoms of the same element…
Correct answer: Catenation- A. sp
- B. sp2
- C. sp3 and sp2
- D. sp2 and sp
Explanation: In propene (C3H6), each carbon atom forms three sigma bonds. One carbon atom forms sigma bonds with three hydrogen atoms, leading to the…
Correct answer: sp3 and sp2- A. Anthracite
- B. Asphalt
- C. Lignite
- D. All of these
Explanation: Peat is an accumulation of partially decayed organic matter found in wetlands.
Correct answer: Lignite- A. Prevent its freezing point
- B. Increase its boiling point
- C. Prevent knocking
- D. Increase its viscosity
Explanation: Tetraethyllead (TEL), not tetramethyl lead, was historically added to petrol (gasoline) as an anti-knock agent to prevent engine knocking…
Correct answer: Prevent knocking- A. Filtration
- B. Fractional distillation
- C. Steam distillation
- D. Fractions sublimation
Explanation: Crude petroleum is separated into fractions through fractional distillation, a process that takes advantage of the differences in boiling…
Correct answer: Fractional distillation- A. None of these
- B. sp2 hybridized
- C. sp hybridized
- D. sp3 hybridized
Explanation: In dimethyl ether (CH3-O-CH3), each carbon atom in the methyl groups is bonded to three hydrogen atoms and one oxygen atom, forming a…
Correct answer: sp3 hybridized- A. 1
- B. 2
- C. 3
- D. 4
Explanation: There are two isomers: butane and isobutane. Butane has a straight-chain structure, while isobutane has a branched structure, making them…
Correct answer: 2- A. Three hydrogen atoms
- B. Two hydrogen atoms
- C. One hydrogen atom
- D. No hydrogen atom
Explanation: Tertiary-butyl alcohol (t-butyl alcohol) has the structural formula (CH3)3COH.
Correct answer: No hydrogen atom- A. Both of these
- B. Inorganic compounds and smelly compounds
- C. None of these
- D. Open and chain alicyclic compounds
Explanation: Organic compounds are classified into open and chain alicyclic compounds.
Correct answer: Open and chain alicyclic compounds- A. sp3
- B. sp2
- C. sp
- D. dsp2
Explanation: Ethyne (C2H2) has sp hybridization. This means that each carbon atom in ethyne forms two sigma bonds using one s and one p orbital…
Correct answer: sp- A. Aldehyde group
- B. Carboxyl group
- C. Ester group
- D. Ether group
Explanation: The ester group is present in ethyl acetate. Ester groups consist of a carbonyl group (C=O) bonded to an oxygen atom, which is further…
Correct answer: Ester group- A. Ether
- B. Aldehyde
- C. Carboxylic acid
- D. Ester
Explanation: The alkoxy carbonyl functional group is a defining feature of esters, which are characterized by the presence of a carbonyl group (C=O)…
Correct answer: Ester- A. (CH3)3COH
- B. CO2
- C. C2H4
- D. CH3COOH
Explanation: This is the correct answer. In (CH3)3COH, the carbon atom is bonded to four other atoms (three hydrogen atoms and one oxygen atom) through…
Correct answer: (CH3)3COH- A. CH3 CH2 CH2 CH2 CH2 CHO
- B. CH3CH2CH(OH)CH2CH3
- C. CH3CH2CH2CH2CH2COOH
- D. CH3CH=CHCH2CH2COCH3
Explanation: This is the functional isomer of CH3 CH2 CH2 CH2 COCH3, as explained previously.
Correct answer: CH3 CH2 CH2 CH2 CH2 CHO