Important MCQs Related to introduction to hydrocarbons and types of hydrocarbons.
1. What elements make up hydrocarbons?
A) Carbon and Oxygen
B) Carbon and Hydrogen
C) Carbon and Nitrogen
D) Carbon and Sulfur
2. What type of bonds can carbon atoms form in hydrocarbons?
A) Single bonds only
B) Single, double, and triple bonds
C) Only double bonds
D) Only triple bonds
3. How are hydrocarbons divided?
A) Two general classes
B) Three general classes
C) Four general classes
D) Five general classes
4. What are alkanes also known as?
A) Saturated hydrocarbons
B) Unsaturated hydrocarbons
C) Aromatics
D) Cyclic hydrocarbons
5. What is the general formula of alkanes?
A) CnH2n
B) CnH2n+2
C) CnH2n-2
D) CnH2n-1
6. What kind of hydrocarbons are methane and ethane?
A) Aromatic
B) Saturated
C) Unsaturated
D) Cyclic
7. What is the general formula for alkenes?
A) CnH2n+2
B) CnH2n
C) CnH2n-2
D) CnH2n-1
8. What functional group do alkenes have?
A) >C=C<
B) –C≡C–
C) –OH
D) –COOH
9. What is the general formula for alkynes?
A) CnH2n+2
B) CnH2n
C) CnH2n-2
D) CnH2n-1
10. What is an example of an alkane?
A) Ethyne
B) Propene
C) Ethane
D) Benzene
11. Which hydrocarbon contains a triple bond?
A) Alkane
B) Alkene
C) Alkyne
D) Aromatic
12. What is the molecular formula of benzene?
A) C6H12
B) C6H6
C) C5H6
D) C7H8
13. What type of hydrocarbons are cyclohexane and cyclobutane?
A) Alkanes
B) Alkenes
C) Cyclic hydrocarbons
D) Alkynes
14. Which hydrocarbon is used as a fuel?
A) Ethane
B) Benzene
C) Methane
D) Propene
15. What are hydrocarbons primarily made up of?
A) Carbon and Oxygen
B) Carbon and Nitrogen
C) Carbon and Hydrogen
D) Carbon and Sulfur
16. What physical state is methane at room temperature?
A) Solid
B) Liquid
C) Gas
D) Plasma
17. What is an example of a liquid hydrocarbon?
A) Methane
B) Hexane
C) Propane
D) Butane
18. What is the classification of ethene?
A) Alkane
B) Alkene
C) Alkyne
D) Aromatic
19. What type of bond is present in alkenes?
A) Single bond
B) Double bond
C) Triple bond
D) No bond
20. What is the starting material for the synthesis of organic chemicals?
A) Nitrogen
B) Oxygen
C) Hydrocarbons
D) Sulfur
21. What is the functional group of alkynes?
A) >C=C<
B) –C≡C–
C) –OH
D) –NH2
22. What is the general formula of cyclic hydrocarbons like benzene?
A) CnH2n+2
B) CnH2n
C) C6H6
D) CnH2n-2
23. Which type of hydrocarbon is used in making plastics?
A) Alkanes
B) Alkenes
C) Alkynes
D) Aromatic hydrocarbons
24. Which of the following is a saturated hydrocarbon?
A) Ethane
B) Ethene
C) Propyne
D) Benzene
25. What do unsaturated hydrocarbons contain?
A) Only single bonds
B) Double or triple bonds
C) No bonds
D) Aromatic rings
26. What is the main use of fossil fuels?
A) Medicine
B) Energy source
C) Food production
D) Water purification
27. What happens to the volatility of hydrocarbons as molecular mass increases?
A) Increases
B) Decreases
C) Stays the same
D) Disappears
28. Which hydrocarbon has the formula C2H6?
A) Ethane
B) Ethene
C) Ethyne
D) Benzene
29. Which hydrocarbon is used in the manufacture of synthetic fibers?
A) Propane
B) Ethene
C) Methane
D) Butane
30. What happens to hydrocarbons with a higher molecular mass?
A) They become gases
B) They become liquids
C) They become solids
D) They evaporate