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 11 of 27
- A. Ethers
- B. Ketones
- C. Both a and b
- D. Every organic family
Explanation: As option A suggests, ethers can exhibit metamerism. Metamerism is a type of structural isomerism where the compounds have the same…
Correct answer: Both a and b- A. n - octane
- B. n - Heptane
- C. 2, 2, 4 - Trimethylpentane (Iso-octane)
- D. 2, 2, 4 - Trimethyl octane
Explanation: Iso-octane has an octane rating of 100, which is the highest rating on the octane scale.
Correct answer: 2, 2, 4 - Trimethylpentane (Iso-octane)- A. sp
- B. sp2
- C. sp3
- D. None of these
Explanation: Methane has a tetrahedral geometry around the central carbon atom, which is achieved through sp3 hybridization.
Correct answer: sp3- A. 5 - 20oC
- B. 10 - 30oC
- C. 20 - 60oC
- D. 30 - 90oC
Explanation: This range is correct because petroleum ether typically boils within the range of 20 to 60°C.
Correct answer: 20 - 60oC- A. Thiophene
- B. Anthracene
- C. Furan
- D. Pyrrol
Explanation: Anthracene is correct because it is a polycyclic aromatic hydrocarbon consisting of three fused benzene rings, making it non-heterocyclic.
Correct answer: Anthracene- A. sp3
- B. sp2
- C. sp
- D. dsp2
Explanation: Ethane consists of two carbon atoms bonded together with single bonds. Each carbon atom forms four single covalent bonds, resulting in a…
Correct answer: sp3- A. Methane
- B. Ethane
- C. Propane
- D. 2-Butene
Explanation: Geometric isomerism, also known as cis-trans isomerism, occurs when there is restricted rotation around a double bond, leading to…
Correct answer: 2-Butene- A. Two sigma bonds
- B. One sigma and one pi bond
- C. One sigma and two pi bonds
- D. Two pi bonds
Explanation: A double bond consists of one sigma bond and one pi bond. The sigma bond is formed by the overlap of hybridized orbitals (e.g., sp² hybrid…
Correct answer: One sigma and one pi bond- A. sp3
- B. sp
- C. sp2
- D. dsp2
Explanation: These orbitals have a planar triangular shape. In sp2 hybridization, one s orbital and two p orbitals combine to form three sp2 hybrid…
Correct answer: sp2- A. G.N. Lewis
- B. Fredrick Wohler
- C. Kolbe
- D. Berzelius
Explanation: In 1828, he synthesized urea from ammonium cyanate, thereby disproving the theory of vitalism, which held that organic compounds could…
Correct answer: Fredrick Wohler- A. Thermal cracking
- B. Reforming
- C. Steam cracking
- D. Combustion
Explanation: Reforming is a process used in petroleum refining to improve the quality of gasoline by rearranging the hydrocarbon molecules to produce…
Correct answer: Reforming- A. CH3OH
- B. (C2H5)2O
- C. CH3OCH3
- D. CH3COCH3
Explanation: This is dimethyl ether, which is an isomer of ethanol. Both dimethyl ether and ethanol have the same number of carbon, hydrogen, and…
Correct answer: CH3OCH3- A. sp3
- B. sp
- C. sp2
- D. dsp2
Explanation: sp hybrid orbitals are formed by the combination of one s and one p orbital, resulting in two linearly oriented sp orbitals at 180 degrees…
Correct answer: sp- A. CH3CN
- B. CHΞCH
- C. HCOOH
- D. CH2Cl2
Explanation: In formic acid (HCOOH), the carbon atom is sp2 hybridized. This is because the carbon atom is bonded to three atoms (two hydrogen atoms…
Correct answer: HCOOH- A. Skeletal
- B. Position
- C. Geometric
- D. Metamerism
Explanation: Skeletal isomerism is correct for alkanes. Alkanes can exhibit skeletal isomerism when the carbon chain arrangement changes, leading to…
Correct answer: Skeletal- A. sp3
- B. sp
- C. sp2
- D. dsp2
Explanation: The carbon in a carbonyl group (C=O) forms a double bond with oxygen. In this structure, the carbon forms three sigma (σ\sigmaσ) bonds…
Correct answer: sp2- A. 6
- B. 5
- C. 3
- D. 2
Explanation: Pentane has three structural isomers: n-pentane, isopentane (2-methylbutane), and neopentane (2,2-dimethylpropane).
Correct answer: 3- A. G.N. Lewis
- B. F. Wöhler
- C. Greek Philosophers
- D. Scientists of 20th century
Explanation: This is the correct option. Friedrich Wöhler, a German chemist, is famously known for synthesizing urea in 1828 from ammonium cyanate.
Correct answer: F. Wöhler- A. Cl2C=CCl2
- B. CH2=CH2
- C. ClCH=CHCl
- D. Br2C=CBr2
Explanation: ClCH=CHCl is correct for showing cis-trans isomerism because it has two different substituents attached to the carbon atoms of the double…
Correct answer: ClCH=CHCl- A. 1-butene
- B. 2-butene
- C. Cyclopropane
- D. Acetone
Explanation: 2-butene may exist as cis-trans isomers because it has a carbon-carbon double bond with two different substituents attached to each carbon…
Correct answer: 2-butene