Free Fundamental Principles of Organic Chemistry MCQs with Answers

• A. CH2
• B. C2H4
• C. C2H6
• D. C4H8

Explanation: For CH2,C2H4 and C3H4 and C3H6C = 85% H = 15%

• A. 5 moles of C
• B. 8 moles of C
• C. 4 moles of C
• D. 13 moles of C

Explanation: Explanation for this question will be added soon!

• A. 20
• B. 40
• C. 50
• D. 60

Explanation: Volume= 5.6 liter. Mass= 10 grams. Volume/22.4 = mole 5.6 /22.4= 0.25 moles. Mole = Mass / Mr Mr = Mass / Mole = 10 / 0.25 = 40.

• A. 12 times
• B. 1/12th
• C. 1/6th
• D. 6 times

Explanation: The atomic mass unit (AMU or amu) of an element is a measure of its atomic mass.

• A. Aniline
• B. Cyclohexanol
• C. Cyclobutane
• D. Neopentane

Explanation: Aniline is an aromatic compound. While B and C are alicyclic, while D is branched aliphatic organic compound.

• A. Asymmetry
• B. Resonance
• C. Rotation around single bond
• D. Restricted rotation around doubled bond

Explanation: Alkanes do not show geometrical isomerism due to free rotation around single bond.

• A. Alkanes
• B. Alkene
• C. Alkynes
• D. Alcohol

Explanation: In alkanes there is no functional group, therefore it can not show positional isomerism

• A. Number of carbon atoms
• B. Number of hydroxyl groups
• C. Position of hydroxyl groups
• D. All of these

Explanation: The correct answer is Option D: All of these. Glycols and glycerols can be differentiated based on the number of carbon atoms (glycol has…

• A. CH3-CH2-OH
• B. CH3COOH
• C. CH3-O-CH3
• D. CH3-CH2-Br

Explanation: Alcohols have OH-group as a functional group.

• A. CnH2n and CnH2n-2
• B. CnH2n-2 and CnH2n+2
• C. CnH2n+2
• D. CnH2n and CnH2n+2

Explanation: Propene is alkene which has general formula CnH2n and Propyne is alkyne with general formula CnH2n-2

• A. 1-Chloro-2-methylbutane
• B. Iso-butyl chloride
• C. 1-Chloro-2-methylpropane
• D. 2-Chloro-2-methyl propane

Explanation: Priority is given to functional group in nomenclature

• A. -COOH
• B. -CHO
• C. -C=O
• D. -COOR

Explanation: Option D is correct because -COOR- is the functional group for Esters. All other options do not represent Ester's functional group.

• A. Hydrocarbons
• B. Derivatives of hydrocarbons
• C. Both A and B
• D. Neither A nor B

Explanation: Classes of organic compounds contains , hydrocarbons as well as there derivatives.. Hence , C is the correct option.

• A. Structural isomers
• B. Stereoisomers
• C. Enantiomers
• D. Diasteromers

Explanation: Both of the stated compounds are only structural isomers of each other and are optically inactive.

• A. Anthracene
• B. Naphthalene
• C. Phenol
• D. All of these

Explanation: Aromatic hydrocarbons containing two or more benzene rings in their molecules are called Polycyclic Aromatic Hydrocarbons.

• A. sp2
• B. sp3
• C. sp
• D. dsp2

Explanation: Each carbon in benzene has 3 σ-bonds and 1 π-bond. 3 σ-bonds means that there are 3 sp2 hybrid orbitals for each carbon.

• A. Tetra-methyl lead
• B. Tetra-ethyl lead
• C. Isooctane
• D. All of these

Explanation: The correct answer is 'All of these' because tetra-methyl lead, tetra-ethyl lead, and isooctane all exhibit antiknock properties.

• A. Position isomers
• B. Chain isomers
• C. Functional group isomers
• D. Metamers

Explanation: Positional isomers are compounds that have the same molecular formula and functional groups but differ in the position of the functional…

• A. Octahedral
• B. Tetrahedral
• C. Trigonal planar
• D. Square planar

Explanation: The geometry of butane is tetrahedral. This means that each carbon atom in butane is bonded to four other atoms, and the angles between…

• A. Rotation around a double bond
• B. Restriction of rotation around a single bond
• C. Restriction of rotation around a double bond
• D. Due to double bond

Explanation: The rotation of two carbon atoms joined by a double bond could happen only if the π bond breaks.This ordinarily costs too much energy…