Alkenes Practice Test Online Quiz

1. In ethene, each hydrogen atom has one unpaired electron, and each carbon is:

sp³ hybridized

sp² hybridized

sp hybridized

Not hybridized

2. Alkenes typically undergo which type of reaction?

Substitution reaction

Elimination reaction

Addition reaction

Rearrangement reaction

3. What is the product obtained when 1-chlorobutane reacts with alcoholic potash?

1-Butene

2-Butene

1-Butanol

2-Butanol

4. The position of a double bond in alkenes can be determined using:

Bromine water

Ozonolysis

Ammonical silver nitrate solution

Baeyer's reagent

5. What is the name of the polymer formed from ethene?

Polypropylene

Polyethylene

Polystyrene

Polyvinyl chloride

6. What is the most commonly used catalyst in the polymerization of ethene?

Ziegler-Natta catalysts

Aluminium triethyl

Metallocene catalysts

Free radical initiators

7. Which is the first member of the alkene family?

Pentene

Methane

Ethylene

Acetylene

8. When propene reacts with HBr in the presence of peroxide, what product is formed?

Allyl bromide

Isopropyl bromide

3-bromopropane

n-propyl bromide

9. Which of the following alkenes exhibits the maximum stability?

Cis-2-butene

1-Butene

Trans-2-butene

2-Methylpropene

10. What is the product obtained when ethylene bromide is treated with Zn?

Alkyne

Alkane

Ethane

Alkene

11. What causes cis-trans isomerism in alkenes?

Restricted rotation about the double bond

Different numbers of carbon atoms

Free rotation about double bond

Free rotation about single bond

12. Which of the following will yield 2 acetaldehyde molecules upon ozonolysis?

1-pentene

2-butene

2-pentene

1-butene

13. Which of the following compounds exhibits geometrical (cis-trans) isomerism?

2-Butene

2-Butyne

2-Butenol

Butanol

14. Among the following, which compound is the most reactive?

Ethane

Ethene

Ethyne

Benzene

15. In alkenes, the carbon atoms are connected to each other by a:

Single bond

Triple bond

Covalent bond

Double bond

16. When an alkene undergoes hydroboration-oxidation, what is the stereochemistry of the resulting alcohol?

Racemic mixture

Retention of configuration

Inversion of configuration

Mixture of retention and inversion

17. You are conducting an experiment to identify an unknown alkene. You add bromine water to an unknown alkene, and the reddish-brown color disappears. What can you conclude?

An unsymmetrical alkene

A symmetrical alkene

A trans-alkene

A cis-alkene

18. Which of the following compound exhibits the E-Z isomerism in its structure?

2-methylpent-2-ene

2,3-methylpentene

3-methylpent-2-ene

2,3-dimethylpent-2-ene

19. Which of the following alkenes is represented by the name "4-chlorobut-1-ene"?

1-Chloro-2-butene

2-Chloro-1-butene

2-Chloro-2-butene

3-Chloro-1-butene

20. You are tasked with distinguishing between two unknown alkenes, A and B. Alkene A is treated with a cold, dilute potassium permanganate (KMnO4) solution, and there is no color change. Alkene B, when treated with the same reagent, decolorizes the solution. Which of the following statements is true?

Alkene A is more substituted than alkene B

Alkene A is less substituted than alkene B

Alkene A is cis, and alkene B is trans

Alkene A is trans, and alkene B is cis

Test Name:	Alkenes Practice Test
Subject Category:	Chemistry
Test Type:	Multiple Choice Questions
Total Score / Questions:	20 / 20
Time Allowed:	10 Min
Who Should Practice this Test:	Students, job seekers, or professionals preparing for competitive exams and interviews.