1. The simplest alkene is:
A) Methane
B) Ethane
C) Ethene
D) Propene

2. Alkenes are also known as:
A) Aromatics
B) Saturated hydrocarbons
C) Olefins
D) Alkanes

3. The word “olefins” is derived from a Latin word meaning:
A) Water-forming
B) Gas-forming
C) Oil-forming
D) Fire-forming

4. Which alkene is present in natural gas up to 20%?
A) Propene
B) Ethylene
C) Butene
D) Methane

5. Alkenes are produced in large amounts by:
A) Distillation
B) Cracking of petroleum
C) Fractional distillation
D) Electrolysis

6. Which of the following is used to prepare alkenes from alcohols?
A) Dehydrohalogenation
B) Dehydration
C) Hydrogenation
D) Halogenation

7. Ethene can be prepared by heating ethanol with:
A) HCl
B) HBr
C) Concentrated sulphuric acid
D) Potassium permanganate

8. Dehydration of alcohols involves the removal of:
A) Oxygen
B) Hydrogen
C) Water
D) Halogen

9. The process of dehydrohalogenation involves the removal of:
A) Water
B) Halogen and hydrogen
C) Oxygen and hydrogen
D) Carbon and hydrogen

10. Physical state of ethene at room temperature is:
A) Solid
B) Liquid
C) Gas
D) Plasma

11. Alkenes are:
A) Polar compounds
B) Nonpolar compounds
C) Soluble in water
D) Highly soluble in water

12. Alkenes are soluble in:
A) Water
B) Organic solvents
C) Acids
D) Alkalis

13. The density of ethene compared to air is:
A) Higher
B) Lower
C) Same
D) None of these

14. Alkenes are hydrocarbons that are:
A) Non-flammable
B) Flammable
C) Non-reactive
D) Non-volatile

15. The flame of alkenes during combustion is:
A) Smokeless
B) Smoky
C) Blue
D) Colorless

16. Alkenes undergo which type of reactions?
A) Substitution
B) Addition
C) Elimination
D) None of these

17. Alkenes are reactive due to the presence of:
A) Single bonds
B) Triple bonds
C) Double bonds
D) No bonds

18. Hydrogenation of alkenes produces:
A) Unsaturated compounds
B) Saturated compounds
C) Alcohols
D) Aldehydes

19. The catalyst used in hydrogenation of alkenes is:
A) KOH
B) HCl
C) Ni or Pt
D) KMnO4

20. Hydrogenation of alkenes is used to produce:
A) Vegetable oil
B) Margarine
C) Soap
D) Perfume

21. The halogenation of alkenes involves the addition of:
A) Hydrogen
B) Halogen
C) Oxygen
D) Water

22. Bromination of alkenes is used to:
A) Identify saturation
B) Identify unsaturation
C) Produce water
D) Produce alcohol

23. The color of bromine water in the bromination of alkenes is:
A) Red-brown
B) Blue
C) Green
D) Colorless

24. Hydrohalogenation of alkenes produces:
A) Alcohol
B) Alkyl halides
C) Aldehyde
D) Carboxylic acid

25. The most reactive hydrogen halide in hydrohalogenation of alkenes is:
A) HI
B) HBr
C) HCl
D) HF

26. The reagent used in oxidation of alkenes is:
A) KCl
B) KMnO4
C) H2SO4
D) HBr

27. Oxidation of alkenes with KMnO4 is used to test:
A) Saturation
B) Unsaturation
C) Halogenation
D) Combustion

28. The product formed by oxidation of ethene with KMnO4 is:
A) Ethanol
B) Ethene glycol
C) Methanol
D) Water

29. The flame produced by combustion of alkenes is smokier than:
A) Alkanes
B) Aromatics
C) Alcohols
D) Esters

30. Which process adds hydrogen to alkenes?
A) Halogenation
B) Hydrogenation
C) Hydrohalogenation
D) Oxidation