Organic chemistry MCQs

By: Prof. Dr. Fazal Rehman | Last updated: May 23, 2025

1. : The main source for an organic compound is…
(A) Plants
(B) Animal
(C) Fossil
(D) Coal

2. : The alkane stem tells us about the…
(A) Number of bonds
(B) Number of Hydrogen atoms
(C) Number of Carbon atoms
(D) Number of molecules

3. : The substance which is the basis of human life on earth is…
(A) Matter
(B) Atom
(C) Molecules
(D) Organic compounds

4. : The octane number of 2,2,4-trimethyl pentane is basically…
(A) 60
(B) 80
(C) 40
(D) 100

5. : An alkyl radical as compared to its parent alkane contains…
(A) One more carbon
(B) One less carbon
(C) One more hydrogen
(D) One less Hydrogen

6. : In which compound is only one benzene ring present…
(A) Carboxylic
(B) Aryl
(C) Ketone
(D) Acryl

7. : The smoky flame which burns hydrocarbons is known as…
(A) Alicyclic
(B) Aldehyde
(C) Aliphatic
(D) Aromatic

8. : The carbon self-linking ability is known as…
(A) Carbonation
(B) Catenation
(C) Sublimation
(D) Oxidation

9. : Which molecule chemists can use to represent complex molecules is…
(A) Structural formula
(B) Skeletal formula
(C) Molecular Formula
(D) A and B

10. : Geometric isomerism is found in…
(A) Alkynes
(B) Alkenes
(C) Alkanes
(D) Ester

11. : Almost how many compounds of carbon are formed…
(A) 65%
(B) 25%
(C) 95%
(D) 99%

12. : The element which is called the backbone of organic molecules is…
(A) Oxygen
(B) Nitrogen
(C) Hydrogen
(D) Carbon