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 25 of 27
- A. Positional isomerism
- B. Geometrical isomerism
- C. Cis-trans isomerism
- D. Functional group isomerism
Explanation: Alkynes can exhibit positional isomerism where the position of the triple bond changes within the carbon chain.
Correct answer: Positional isomerism- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: For geometric isomerism to be possible two adjacent carbon atoms must have two different groups attached to them which is only in the case…
Correct answer: Option B- A. 4
- B. 3
- C. 2
- D. 1
Explanation: CH4 is a hydrocarbon molecule consisting of four carbon atom. It can exist in only two structural isomers: The two isomers of C4H10 differ…
Correct answer: 2- A. Reforming
- B. Isomerism
- C. Polymorphism
- D. Hybridization
Explanation: Compounds that have the same molecular formula but different chemical structures are called isomers and phenomenon is called…
Correct answer: Isomerism- A. Methane
- B. Ethane
- C. Propane
- D. Butane
Explanation: d) ButaneButane (C4H10) is a hydrocarbon consisting of four carbon atoms and ten hydrogen atoms.
Correct answer: Butane- A. Amino acids
- B. Ketones
- C. Carboxylic acids
- D. All of these options are correct
Explanation: Tautomerism is when a carbon-carbon double bond is shifted to another atom.
Correct answer: All of these options are correct- A. 2
- B. 4
- C. 6
- D. 5
Explanation: Butane has two isomers. The two chain isomers of butane (C4H10) are n-butane and isobutane. Hence, A is the correct option
Correct answer: 2- A. Electron
- B. Carbon atom
- C. Functional group
- D. H-atom
Explanation: Option A is wrong because tautomerism doesn't involve the transfer of electrons. It involves the transfer of hydrogen atoms.
Correct answer: H-atom- A. Two
- B. Four
- C. Three
- D. Five
Explanation: Pentane has 'three isomers': n-pentane, iso-pentane, and neo-pentane.
Correct answer: Three- A. Butane
- B. Butanone
- C. Butene
- D. Butyne
Explanation: Butane is the first hydrocarbon for which branching is possible, and it has the formula C4H10, hence the simplest compound out of all the…
Correct answer: Butane- A. Tautomerism
- B. Metamerism
- C. Geometrical isomerism
- D. Position isomerism
Explanation: b) Metamerism: Metamerism is a type of isomerism where two or more compounds have the same molecular formula but differ in the arrangement…
Correct answer: Metamerism- A. Reforming
- B. Isomerism
- C. Polymorphism
- D. Hybridization
Explanation: Isomerism is the existence of molecules that have the same numbers of the same kinds of atoms (and hence the same formula) but differ in…
Correct answer: Isomerism- A. Acid number
- B. Iodine number
- C. Saponification number
- D. None of these
Explanation: Iodine value, also called Iodine Number, in analytical chemistry, a measure of the degree of unsaturation of oil, fat, or wax; the amount…
Correct answer: Iodine number- A. Condensation
- B. Polymerization
- C. Cyclization
- D. Catenation
Explanation: Catenation is the ability of an element to bond with itself to form long chains or rings.
Correct answer: Catenation- A. Cu2Cl2 and NH4Cl
- B. Al2O3 and NH4Cl
- C. Cu2Cl2 and NH4OH
- D. Cu2Cl2 and Al2O3
Explanation: A is correct since Cu2Cl2 and NH4Cl is used as catalyst for preparation of acrylonitrileB is incorrect because Al2O3 and NH4Cl is not act…
Correct answer: Cu2Cl2 and NH4Cl- A. Nucleophile
- B. Electrophile
- C. Protophile
- D. None of the given options
Explanation: Nucleophiles contain an unshared pair of electrons, and they look for a positive 'centre' to bond with.
Correct answer: Nucleophile- A. Cyano compounds
- B. Nitro compounds
- C. Carbon nitrogen compounds
- D. Nitriles
Explanation: In organic chemistry compounds which contain CN are called nitriles such as CH3CH2CN is called ethanenitrile.
Correct answer: Nitriles- A. 2-aminopropanoic acid
- B. 2-aminoethanoice acid
- C. 2-aminobutane-1,4-dioic acid
- D. 2-aminobutanoic acid
Explanation: The IUPAC name of Alanine is 2-aminopropanoic acid since the amino group is bonded to carbon number 2 and the longest chain is of 5 carbons.
Correct answer: 2-aminopropanoic acid- A. Secondary alcohol, nitrile, and phenol ring
- B. Secondary alcohol, amine, and benzene ring
- C. Secondary alcohol, nitrile, and aryl ring
- D. Primary alcohol, nitrile, and benzene ring
Explanation: The functional groups are: secondary alcohol, nitrile, and benzene/aryl ring.Option A incorrectly mentions phenol as there is no hydroxyl…
Correct answer: Secondary alcohol, nitrile, and aryl ring- A. Metamerism
- B. Functional group
- C. Chain
- D. Position
Explanation: CH3-O-CH3 exhibits functional group isomerism. The compounds having the same molecular formula but different functional groups are said to…
Correct answer: Functional group