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 7 of 27
- A. Alkynes
- B. Nitroalkanes
- C. Carboxylic acid
- D. Alcohol
Explanation: In carboxylic acids position of functional group does not change therefore they do not show positional isomerism.
Correct answer: Carboxylic acid- A. Metamerism
- B. Tautomerism
- C. Position
- D. Functional
Explanation: A tautomer of a compound refers to the isomer of the compound which only differs in the position of protons and electrons so, B is…
Correct answer: Tautomerism- A. Four
- B. Five
- C. Three
- D. Six
Explanation: Butanol (also called butyl alcohol) is a four-carbon alcohol with a formula of C4H9OH, which occurs in five isomeric structures (four…
Correct answer: Four- A. Chain isomerism
- B. Position isomerism
- C. Cis-trans isomensm
- D. Optical isomerism
Explanation: Chain isomerism is a type of isomerism arises due to the difference in the nature of the carbon chain.
Correct answer: Chain isomerism- A. 1
- B. 3
- C. 2
- D. 5
Explanation: A chiral centre is an atom especially in an organic molecule that has four unique atoms or groups attached to it.
Correct answer: 3- A. Amino acids
- B. Amines
- C. Carboxylic acids
- D. All of these
Explanation: Tautomerism is a form of isomerism involving the migration of a proton.
Correct answer: Amino acids- A. 1-hexene
- B. 2-hexene
- C. 3-hexene
- D. 4-hexene
Explanation: The formula of 1-hexene is Ch3-CH2-CH2-CH2-CH=CH2.The one carbon atom bearing a double bond is attached to two H atoms.Hence,it does not…
Correct answer: 1-hexene- A. Position
- B. Chain
- C. Functional group
- D. Metamers
Explanation: Functional group Functional Isomerism is the type of isomerism formed by compounds that have same molecular formula but different…
Correct answer: Functional group- A. Position isomerism
- B. Functional group isomerism
- C. Metamerism
- D. Cis trans isomerism
Explanation: Metmerism is commonly found in ethers.In this isomerism,the nature of alkyl groups may differ.This occurs due to the unequal distribution…
Correct answer: Metamerism130. The compounds in which similar groups are present on the same side of a double bond are called as _?
- A. Trans isomers
- B. Positional isomers
- C. Cis isomers
- D. None of these
Explanation: In geometric isomerism, the prefix "cis-" (from Latin, meaning "on this side") is used to describe the isomer where two similar or…
Correct answer: Cis isomers- A. Optical isomerism
- B. Geometric isomerism
- C. Both A and B
- D. None of these
Explanation: 2-Pentene shows geometric isomerism. As it has a double bond, and both carbons have a different group attached to them.
Correct answer: Geometric isomerism- A. 2
- B. 3
- C. 4
- D. 5
Explanation: There should be minimum 3 carbon atoms in a compound to show position isomerism.
Correct answer: 3- A. Structural Isomerism
- B. Stereo Isomerism
- C. Geometrical Isomerism
- D. Optical Isomerism
Explanation: The restricted rotation of an atom or groups around the doubly bonded carbon gives different geometries of a compound.Such compounds are…
Correct answer: Geometrical Isomerism- A. Must contain at least four carbon atoms.
- B. When in solution rotate the plane of polarized light to the left.
- C. Must always contain asymmetric carbon atom.
- D. In solution always give a negative reading in polarimeter.
Explanation: If the compound consists of more than one carbon and contained at least one chiral carbon, it will make the compound optically active.
Correct answer: Must always contain asymmetric carbon atom.- A. Heterocyclic
- B. Hemicyclic and aromatic
- C. Aromatic but not hemicyclic
- D. Hemicyclic but not aromatic
Explanation: Hemicyclic: The compound has a six-atom ring system, indicating a six-membered ring.
Correct answer: Hemicyclic and aromatic- A. Nature of reactant
- B. Nature of reaction
- C. Nature of precipitate
- D. Nature of filtrate
Explanation: The choice of filter media for filtration depends significantly on the nature of the precipitate formed during the reaction.
Correct answer: Nature of precipitate- A. PCl3
- B. SO2
- C. SF6
- D. CHCl
Explanation: SF6 (sulfur hexafluoride) is not polar. In SF6, sulfur is bonded to six fluorine atoms, and all the bond dipoles cancel each other out due…
Correct answer: SF6- A. H2 + I2 ⇌ 2HI
- B. N2 + O2⇌2NO
- C. PCl5⇌ PCl3 + Cl2
- D. N2 + 3H2⇌ 2NH3
Explanation: In the Haber process, which is represented by the reaction N2 + 3H2 ⇌ 2NH3, an increase in pressure favors the reaction in the forward…
Correct answer: N2 + 3H2⇌ 2NH3- A. It increases the boiling point of radiator coolant
- B. It is non-volatile in character
- C. Has low vapour pressure as compared to water
- D. All of the above
Explanation: This is the correct answer. Let's explore why each reason contributes:Increases boiling point: Ethylene glycol has a higher boiling point…
Correct answer: All of the above- A. H2O2
- B. Zn dust
- C. Ethyl bromide
- D. HOCl
Explanation: The preparation of benzene from phenol involves a reaction called reduction.
Correct answer: Zn dust