Free Fundamental Principles of Organic Chemistry MCQs with Answers

• A. CH3CH2OH
• B. CH3OCH3
• C. Both a and b
• D. None of the above

Explanation: An isomer of C3H8O must contain three carbon atoms. Both CH3CH₂OH and CH₂OCH, have the molecular formula C₂H6O, so neither is an isomer of…

• A. Methanol
• B. Propanol
• C. Ethanol
• D. Butanol

Explanation: The compound has three carbon atoms and an -OH group ; hence, it is named propanol.

• A. 184 billion tonnes
• B. 184 million tonnes
• C. 841 billion tonnes
• D. 184 tonnes

Explanation: This is the correct estimate of Pakistan's total coal resources as estimated by the geological survey.

• A. (CH3)2 CHOH
• B. CH3CH2OH
• C. CHO-CHO
• D. None

Explanation: Ethanol is a functional group isomer of dimethyl ether. Both compounds have the same molecular formula (C2H6O) but different functional…

• A. Bituminous
• B. Sub-bituminous coal
• C. Anthracite
• D. Lignite

Explanation: Coal is classified into four main types based on its carbon content, heating value, and other properties.

• A. Anthracene
• B. Phenol
• C. Pyridine
• D. Aniline

Explanation: Pyridine is a heterocyclic compound containing a six-membered ring with five carbon atoms and one nitrogen atom.

• A. CH3-CH3
• B. CH2=CH2
• C. CHΞCH
• D. None

Explanation: Explanation for this question will be added soon!

• A. C6H5
• B. C6H5-NH2
• C. C6H5-NH-C6H5
• D. C6H5-NO2

Explanation: Option b is the correct formula for aniline. Aniline is an aromatic amine with a benzene ring (C6H5) attached to an amino group (-NH2)…

• A. C3H8
• B. C3H4
• C. C3H5
• D. C3H6

Explanation: This formula correctly represents cyclopropane, which consists of a ring of three carbon atoms and six hydrogen atoms.

• A. n-Octane
• B. n-Heptane
• C. Iso-Octane
• D. n-Hexane

Explanation: Iso-octane (2,2,4-trimethylpentane) has an octane number of 100, which is the highest on the octane rating scale.

• A. CH2 group
• B. CH3 group
• C. CH4 group
• D. CH group

Explanation: Homologues of alkanes differ from each other by a CH2 group, which corresponds to the addition of one methylene (-CH2-) unit in their…

• A. H2 and CH4
• B. Ethane and CO
• C. H2 and CO
• D. H2, CH4 and CO

Explanation: This is the correct answer, as it includes all three major components of coal gas: hydrogen (H2), methane (CH4), and carbon monoxide (CO).

• A. Ether
• B. Alcohol
• C. Ketone
• D. Aldehyde

Explanation: Ketones have a carbonyl group (C=O) bonded to two alkyl or aryl groups. This fits the description given in the question.

• A. Aldehydes
• B. Ketones
• C. Alcohols
• D. Both a and b

Explanation: The carbonyl group (C=O) is present in both aldehydes and ketones.

• A. (NH4)2CO
• B. (NH2)4C
• C. (NH2)2CO
• D. (NH4)2CO3

Explanation: Option c correctly represents urea, which consists of two amine groups (-NH2) bonded to a carbonyl group (C=O).

• A. 20% Gasoline
• B. 30% Gasoline
• C. 15% Gasoline
• D. 10% Gasoline

Explanation: Gasoline typically makes up about 20% of the products obtained from fractional distillation of crude oil.

• A. (C2H5)2Pb
• B. (C2H5)4Pb
• C. (C2H5)3Pb
• D. (C2H5)4Pd

Explanation: This compound is tetraethyllead, which was widely used as an antiknock agent in gasoline before being phased out due to environmental and…

• A. Faraday
• B. Hoffman
• C. F. Wohler
• D. Democritus

Explanation: Friedrich Wohler's synthesis of urea is a landmark event in the history of organic chemistry, earning him the title of the "Father of…

• A. Methane
• B. Benzene
• C. Ethene
• D. Ethyne

Explanation: Ethyne is an example of sp hybridization, where one s orbital and one p orbital combine to form two sp hybrid orbitals, which are linear…

• A. Three
• B. Two
• C. One
• D. Zero

Explanation: Pentane (C5H12) has three chain isomers. These are n-pentane, isopentane (2-methylbutane), and neopentane (2, 2-dimethylpropane).