Free Benzene and Aromatic Compounds MCQs with Answers
172 Benzene and Aromatic Compounds MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Benzene has a planar ring of delocalised π electrons, giving aromatic stability and equal carbon-carbon bond lengths. The topic covers resonance, electrophilic substitution reactions such as nitration, halogenation, sulphonation and Friedel-Crafts reactions, along with substituent effects and the distinction between substitution in benzene and addition in ordinary alkenes.
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172 questions · page 9 of 9
- A. -R
- B. -COR
- C. -NH2
- D. NR2
Explanation: Ortho and para directing grps release electrons to the benzene ring increasing the chemical reactivity of the benzene ring towards…
Correct answer: -COR- A. Chlorobenzene
- B. Acetophenone
- C. Benzoic acid
- D. Benzophenone
Explanation: The reaction between benzene and acetyl chloride in the presence of lewis acid results in the formation of an aryl ketone , methyl phenyl…
Correct answer: Acetophenone- A. Benzene
- B. Toluene
- C. O-Xylene
- D. Metaxylene
Explanation: Acetylene on passing through a red hot iron tube undergoes cyclic polymerization.
Correct answer: Benzene- A. -OH
- B. -NH2
- C. -Cl
- D. -OCH3
Explanation: In electrophilic aromatic substitution, the nature of the substituent on the benzene ring plays a crucial role in determining the position…
Correct answer: -Cl- A. Benzene
- B. Toluene
- C. Benzoic acid
- D. Nitrobenzene
Explanation: The correct answer is Toluene. Toluene undergoes nitration much faster than benzene due to the presence of a methyl group.
Correct answer: Toluene- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Cresol is a derivative of benzene that has a methyl group CH3 and a phenol group OH attached to the benzene ring.Ortho-Cresol, also called…
Correct answer: Option D- A. -OH
- B. -NR2
- C. -CN
- D. -OR
Explanation: The correct answer is -CN. The -CN group is a meta-directing group because it withdraws electron density from the benzene ring…
Correct answer: -CN- A. -NH4+
- B. -NH3
- C. -C≡N
- D. -COR
Explanation: Activating groups are Atoms or groups that make the benzene molecule more reactive by increasing the ring's electron density.The resonance…
Correct answer: -NH4+- A. Nitrobenzene
- B. Benzoic acid
- C. Benzaldehyde
- D. Phenol
Explanation: Option "a) Nitrobenzene," "b) Benzoic acid," and "c) Benzaldehyde" do not have electron-donating groups like the hydroxyl group in phenol.
Correct answer: Phenol- A. m-nitro benzoic acid
- B. o-nitro benzene methanoic acid
- C. o-nitro benzoic acid
- D. None of the above
Explanation: When two functional groups are next to each other in a benzene ring, we call them ortho group or o-group.
Correct answer: o-nitro benzene methanoic acid- A. m-chloro nitrobenzene
- B. o-chloro nitrobenzene
- C. p-chloro nitrobenzene
- D. All of above
Explanation: When nitrobenzene and chlorine come together in the presence of AlCl3, they undergo a chemical reaction.
Correct answer: m-chloro nitrobenzene- A. Benzene
- B. 1,3 -Dinitrobenzene
- C. Nitrobutene
- D. 1,3,5 trinitrobenzene
Explanation: Benzene is reactive because of its delocalized pi electron system. This system of alternating double bonds makes benzene more stable than…
Correct answer: Benzene