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 26 of 27
- A. 1-butene
- B. 1-hexene
- C. 1-bromo-2-chloropropene
- D. Propene
Explanation: Explanation:1-bromo-2-chloropropene has two different groups (bromo and chloro) attached to the double bond, allowing for the possibility…
Correct answer: 1-bromo-2-chloropropene- A. Cis-trans isomerism
- B. Chain isomerism
- C. Position isomerism
- D. Functional group isomerism
Explanation: Positional isomers are constitutional isomers that have the same carbon skeleton and the same functional groups but differ from each other…
Correct answer: Position isomerism- A. Option A: 1-butene
- B. Option B: 2-butene (trans)
- C. Option C: 2-butene (cis)
- D. Option D: Cyclohexane
Explanation: In the context of alkenes, cis-isomerism occurs when two identical or similar groups are on the same side of a double bond.
Correct answer: Option C: 2-butene (cis)- A. A
- B. B
- C. C
- D. D
Explanation: Isomers are those compounds that have diff structures but the same molecular formula, which is the case in A only, they form cis- trans…
Correct answer: A- A. CHCl=CCl2 and CH2=CH
- B. CHCl=CH2 and CH2=CHCl
- C. CH3CH=CHCH3 and H3CCH=CHCH3
- D. CH3CH3 and CH2=CH
Explanation: For geometric isomers, the basic conditions are Alternative groups are present in our carbons atoms There should be a carbon-carbon double…
Correct answer: CH3CH=CHCH3 and H3CCH=CHCH3- A. Chain isomerism
- B. Position isomerism
- C. Cis-Trans isomerism
- D. Optical isomerism
Explanation: In chain isomerism, the molecular formula of the isomers is same but they differ in the carbon chain or carbon skeleton.
Correct answer: Chain isomerism- A. 5
- B. 3
- C. 4
- D. 2
Explanation: Butane is an alkane with four carbon atoms so the molecular formula is C4H10. It has two isomers; n-butane and isobutane.
Correct answer: 2- A. C2H4
- B. C2H2Cl4
- C. C2H2Br2
- D. C2HCl3
Explanation: For cis-trans isomerism, the rotation must be restricted in the molecule (so, cannot occur in compounds that only have C-C single bonds)…
Correct answer: C2H2Br2- 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- A. Multiple bonds
- B. Hybridization
- C. Long chain or rings of carbon atom
- D. Showing isomerism
Explanation: C (long chain or rings of carbon atom) is the correct answer as it specifically describes the process of catenation, where carbon atoms…
Correct answer: Long chain or rings of carbon atom- A. (H₂N)2CO
- B. NH4CNO
- C. CH₂NO₂
- D. CH4
Explanation: The correct answer is ammonium cyanate (NH4CNO), which is not considered an organic compound as it lacks carbon-hydrogen (C-H) bonds, a…
Correct answer: NH4CNO- A. 2 Hydrogens
- B. 2 Carbons
- C. 3 Carbons
- D. 4 Carbons
Explanation: A tertiary carbon is a carbon atom bonded directly to three other carbon atoms.
Correct answer: 3 Carbons- A. Electrophilic addition
- B. Electrophilic substitutions
- C. Free radical substitutions
- D. All are possible
Explanation: Chemical reactions associated with hydrocarbons are:Electrophilic addition, Electrophilic substitutions, Free radical substitutions.
Correct answer: All are possible- A. Natural gas
- B. Petroleum
- C. Coal
- D. Ammoniacal Liquor
Explanation: Ammoniacal liquor is an organic compound. It is a concentrated solution of ammonia, ammonium compounds, and sulfur compounds, obtained as…
Correct answer: Ammoniacal Liquor- A. Homocyclic compounds
- B. Heterocyclic compounds
- C. Alicyclic compound
- D. Aromatic homocyclic compounds
Explanation: Thiophene is indeed a heterocyclic compound. It consists of a ring structure made up of four carbon atoms and one sulfur atom.
Correct answer: Heterocyclic compounds- A. Peat
- B. Urea
- C. Sugar
- D. Alcohol
Explanation: The first organic compound prepared in the laboratory was urea. Urea was synthesized by Friedrich Wöhler in 1828 from inorganic starting…
Correct answer: Urea- A. Hydrocarbons
- B. Homocyclic
- C. Alicyclic
- D. Heterocyclic
Explanation: Pyrole is a heterocyclic compound. Heterocyclic compounds are organic compounds with a ring structure that contains in the cycle at least…
Correct answer: Heterocyclic- A. Primary amines
- B. Secondary amines
- C. Tertiary amines
- D. All of these
Explanation: Only primary amines give the carbylamine test. Hoffmann's carbylamine test/ Isocyanide test:Aliphatic or aromatic primary amines on…
Correct answer: Primary amines