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 15 of 27
- A. Steam cracking
- B. Reforming
- C. Catalytic cracking
- D. Distillation
Explanation: Reforming is used to improve the quality of gasoline because it converts low-octane naphtha into high-octane reformates.
Correct answer: Reforming- A. Carbon
- B. Hydrogen
- C. Potassium
- D. Hydrocarbons
Explanation: Hydrocarbons are organic compounds that contain only hydrogen and carbon.
Correct answer: Hydrocarbons- A. CH3 -O- CH2 - CH3
- B. CH3 - CO - CH2 - CH3
- C. CH3COCOOH
- D. CH3 - CH2CHO
Explanation: The correct answer is Option B: CH3 - CO - CH2 - CH3. This compound is a ketone with the general formula R-CO-R', and its chemical name is…
Correct answer: CH3 - CO - CH2 - CH3- A. Catalytic cracking
- B. Steam cracking
- C. Thermal cracking
- D. All of these
Explanation: Catalytic cracking produces gasoline of higher octane number and, therefore, this method is used for obtaining better quality gasoline.
Correct answer: Catalytic cracking- A. Alicyclic
- B. Aliphatic compounds
- C. Aromatic compounds
- D. Acyclic compounds
Explanation: The compounds in which the ring consists of only carbon atoms are Homocyclic or carbocyclic compounds.
Correct answer: Aromatic compounds- A. Thermal cracking
- B. Catalytic cracking
- C. Steam cracking
- D. Reforming
Explanation: Catalytic cracking is a process in which complex hydrocarbons are broken down into simpler molecules.
Correct answer: Catalytic cracking- A. CHCl = CCl2 and CH2 = CH2
- B. CHCI= CH2 and CH2 = CHCl
- C. CH3 - CH=CH - CH3 and H3C-CH = CH - CH3
- D. CH3 - CH3 and CH2 - CH2
Explanation: Cis-trans isomerism specifically refers to the arrangement of groups around a double bond.
Correct answer: CH3 - CH=CH - CH3 and H3C-CH = CH - CH3- A. Cyano compounds
- B. Nitro compounds
- C. Carbon nitrogen molecule
- D. Imines
Explanation: Compounds having the C = NH group are called imines. An imine is a functional group or chemical compound that contains a carbon-nitrogen…
Correct answer: Imines- A. 1-Bromo-2-chloropropene
- B. 2-Pentene
- C. 2.3-Dimethylpropene
- D. Both A and B
Explanation: Option D is correct because both options A and B are correct. 1-Bromo-2-chloropropene (CH3 CCl=CH2Br) exhibits geometric isomerism due to…
Correct answer: Both A and B- A. Aromatic compounds
- B. Alicyclic compounds
- C. Aliphatic compound
- D. Heterocyclic compounds
Explanation: The cyclobutane structure is categorized under alicyclic compounds. Alicyclic compounds are a type of organic compounds that contain one…
Correct answer: Alicyclic compounds- A. 500°C, 2atm
- B. 900°C. 2atm
- C. 500°C. 4atm
- D. 900°C. 4atm
Explanation: The temperature for catalytic cracking is usually in the range of 450°C to 550°C.
Correct answer: 500°C, 2atm- A. -COOH
- B. -COOR
- C. -CO-O-CO
- D. -CO-
Explanation: Option D is correct because an anhydride is a functional group that consists of two acyl groups (R-CO-) linked by an oxygen atom.
Correct answer: -CO-O-CO- A. Hydroxyl group
- B. Benzene group
- C. Aldehyde group
- D. Carboxylic acid group
Explanation: Benzene is just a homounsaturatedcyclic compound which follows Huckle's Rule and classified as an aromatic comound.
Correct answer: Benzene group- A. Cyclohexane
- B. Cyclohexene
- C. Tetrahydrofuran
- D. Acetic acid
Explanation: Acetic acid is the correct answer as it is not an alicyclic compound. Unlike alicyclic compounds that have a cyclic structure, acetic acid…
Correct answer: Acetic acid- A. Sigma bonds
- B. Pi bonds
- C. Hydrogen bonds
- D. None of these
Explanation: Pi bonds are formed by the overlap of two parallel p orbitals. Pi bonds are present in alkenes and alkynes, but not in alkanes.
Correct answer: Pi bonds- A. Methanol
- B. Diethyl ether
- C. Acetone
- D. Dimethyl ether
Explanation: Ethanol is a functional isomers of dimethyl ether, as both have the same molecular formula CH3CH2OH
Correct answer: Dimethyl ether- A. 2-butene
- B. 2-butyne
- C. 2-butanol
- D. butanal
Explanation: 2-butene is the only compound among the options that has a carbon-carbon double bond, which allows for restricted rotation, giving rise to…
Correct answer: 2-butene- A. Stereoisomerism
- B. Structural isomerism
- C. Functional group isomerism
- D. Position isomerism
Explanation: Geometric isomerism is a type of stereoisomerism.The isomers in which the order of atom binding is the same,but the arrangement of atoms…
Correct answer: Stereoisomerism- A. Opposite
- B. Same
- C. None of these
- D. Center
Explanation: In the cis isomer two, "X" and "Y" groups lie on the same side of double bond.
Correct answer: Same- A. Same
- B. Identical
- C. Different
- D. None of these
Explanation: The necessary and sufficient condition for a compound to exhibit geometric isomerism is that the two groups attached to the same carbon…
Correct answer: Different