Hydrocarbons (Aliphatic & Aromatic) Quiz - ICSE Class 11 Chemistry

Free practice quiz: Hydrocarbons (Aliphatic & Aromatic) (ICSE Class 11 Chemistry). 47 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 11 Chemistry practice quiz has 47 multiple-choice questions on Hydrocarbons (Aliphatic & Aromatic), and 47 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following is the correct IUPAC name for tert-butylbenzene?

   1. 1,1-dimethylethylbenzene
   2. phenyl-tert-butane
   3. (1-methylethyl)benzene
   4. tert-butylbenzene
   Show answer

   Answer: A. 1,1-dimethylethylbenzene

   The IUPAC naming convention for alkylbenzenes prioritizes the benzene ring as the parent. The tert-butyl group is a C(CH3)3 group attached to the benzene ring. The tert-butyl group is named as 1,1-dimethylethyl. Therefore, tert-butylbenzene is correctly named as 1,1-dimethylethylbenzene.

2. The compound formed by the reaction of benzene with acetyl chloride in the presence of anhydrous aluminium chloride is:

   1. Ethylbenzene
   2. Acetophenone
   3. Benzaldehyde
   4. Benzyl alcohol
   Show answer

   Answer: B. Acetophenone

   This is a Friedel-Crafts acylation reaction. Benzene reacts with acetyl chloride (CH3COCl) in the presence of AlCl3. The acylium ion (CH3CO+) is the electrophile, which attacks the benzene ring. This leads to the formation of acetophenone, also known as phenyl methyl ketone.

3. Which of the following reactions is an example of electrophilic addition?

   1. Addition of HBr to propene
   2. Addition of Br2 to benzene
   3. Dehydrohalogenation of bromoethane
   4. Wurtz reaction
   Show answer

   Answer: A. Addition of HBr to propene

   Electrophilic addition is characteristic of alkenes and alkynes. The pi electrons of the double bond act as a nucleophile, attacking an electrophile, which then adds to the molecule. The addition of HBr to propene involves the attack of the pi bond on H+, making it an electrophilic addition. Addition of Br2 to benzene is electrophilic aromatic substitution, dehydrohalogenation is elimination, and Wurtz reaction is coupling.

4. What product is formed when benzene is heated with excess of cold concentrated sulfuric acid?

   1. Benzenesulfonic acid
   2. 1,2-benzenedisulfonic acid
   3. 1,3-benzenedisulfonic acid
   4. 1,4-benzenedisulfonic acid
   Show answer

   Answer: A. Benzenesulfonic acid

   Benzene undergoes sulfonation with concentrated sulfuric acid. At lower temperatures and with a limited amount of sulfuric acid, monosulfonation occurs, yielding benzenesulfonic acid. Disulfonation requires higher temperatures and/or fuming sulfuric acid.

5. Which reaction is characteristic of aromatic compounds, preserving the aromaticity of the ring?

   1. Addition of H2
   2. Addition of Br2 under UV light
   3. Electrophilic substitution
   4. Combustion
   Show answer

   Answer: C. Electrophilic substitution

   Aromatic compounds are stabilized by delocalized pi electrons, and they readily undergo electrophilic substitution reactions where an electrophile replaces a hydrogen atom on the ring, thereby maintaining the aromatic system. Addition reactions typically disrupt aromaticity.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the major product when n-butane is subjected to free radical chlorination under UV light?
2. Ozonolysis of benzene followed by reductive workup yields:
3. Which of the following reagents can be used to convert an alkene to an alkane?
4. The reaction of acetylene with excess hydrogen iodide (HI) results in the formation of:
5. Which of the following compounds is not an aromatic hydrocarbon?
6. Wurtz reaction is used for the synthesis of:
7. Friedel-Crafts alkylation of benzene with methyl chloride in the presence of anhydrous aluminium chloride (AlCl3) yields:
8. Which of the following is an anti-Markovnikov addition product of propene with HBr?
9. Dehydrogenation of ethane to ethene can be carried out using:
10. Which reaction is used to convert 1,1,1-trichloroethane to ethyne?
11. The addition of bromine to benzene in the absence of Lewis acid catalyst under UV light leads to:
12. Which isomer of C5H12 has the highest boiling point?
13. Which of the following is the most stable carbocation?
14. The process of converting alkenes into alkanes by the addition of hydrogen is called:
15. Electrophilic aromatic substitution of benzene with nitronium ion (NO2+) results in the formation of:
16. What is the primary product of the catalytic cracking of long-chain alkanes?
17. Anti-Markovnikov addition of HBr to an alkene is facilitated by:
18. The most reactive species towards electrophilic substitution on benzene is:
19. Which of the following hydrocarbons is a cycloalkane?
20. The ozonolysis of cyclopentene followed by reductive workup yields:
21. Which of the following is not a characteristic of benzene?
22. The cracking of hydrocarbons is primarily done to:
23. Which is the most common method for the laboratory preparation of ethene?
24. What is the role of anhydrous AlCl3 in the Friedel-Crafts alkylation of benzene?
25. Which of the following is an example of a conjugated diene?
26. Which of the following undergoes free radical addition of HCl?
27. The Diels-Alder reaction is a [4+2] cycloaddition reaction that typically involves:
28. Which reaction is most suitable for converting naphthalene to phthalic anhydride?
29. The addition of water to alkynes in the presence of mercuric sulfate and dilute sulfuric acid follows:
30. What is the name of the process by which benzene is converted to cyclohexane?
31. Which compound will give a positive Lassaigne's test for nitrogen?
32. Which type of isomerism is exhibited by but-1-ene and but-2-ene?
33. Which of the following has the highest boiling point?
34. Which of the following is an example of an alkane?
35. The reaction of acetylene with ammoniacal cuprous chloride solution is a test for:
36. The addition of halogens to benzene under UV light leads to:
37. Which of the following has the highest octane rating?
38. Complete combustion of propane (C3H8) produces:
39. The compound formed when benzene reacts with concentrated nitric acid and concentrated sulfuric acid is:
40. Which of the following has a planar structure and exhibits resonance?
41. The Kolbe reaction involves the carboxylation of phenol with:
42. Which of the following hydrocarbons is a branched alkane?

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