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Polynuclear Hydrocarbons MCQ. We covered all the Polynuclear Hydrocarbons MCQ in this post for free so that you can practice well for the exam.
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MCQ on Polynuclear Hydrocarbons for NEET Students
The arrangement of substituent groups in resorcinol is identical to that found in:
(a) Salicylic acid
(b) Anisole
(c) p-Toluidine
(d) m-Xylene
Option d – m-Xylene
Which hydrocarbon gives OHC(CH₂)₄CHO upon ozonolysis?
(a) Benzene
(b) Hex-3-ene
(c) Cyclohexene
(d) Toluene
Option c – Cyclohexene
The transformation of benzene into chlorobenzene can be accomplished using:
(a) AlCl₃
(b) BCl₃
(c) FeCl₃
(d) All of the above
Option d – All of the above
Which of the following groups, when attached to a benzene ring, predominantly directs an incoming electrophile to the meta position?
i. –CH₃
ii. –NR₂
iii. (CH₃)₃N
iv. –CCl₃
v. –NHCOCH₃
(a) ii and v only
(b) i and iv only
(c) iii and v only
(d) iii and iv only
Option d – iii and iv only
Choose the INCORRECT statement:
(a) Benzene prefers electrophilic substitution over nucleophilic substitution.
(b) Benzene resists addition reactions under normal conditions due to a lack of pure double bonds.
(c) The arenium ion formed during electrophilic substitution retains aromaticity.
(d) In nitration, nitric acid acts as a base while sulfuric acid functions as an acid to generate the nitronium ion.
Option c – The arenium ion formed during electrophilic substitution retains aromaticity.
Which reagent combination is used to convert benzene into maleic anhydride?
(a) Oxygen and V₂O₅ at 773 K
(b) KMnO₄, KOH at 383 K followed by dilute H₂SO₄
(c) CrO₂Cl₂ in CS₂ followed by hydrolysis
(d) Ozone in CH₂Cl₂ at 196 K
Option a – Oxygen and V₂O₅ at 773 K
Which of these compounds will undergo meta-substitution upon monochlorination?
(a) Phenol
(b) Ethoxybenzene
(c) Ethyl benzoate
(d) Chlorobenzene
Option c – Ethyl benzoate
All of the following nitrogen-containing heterocycles are aromatic, EXCEPT:
(a) Pyrrole
(b) Pyridine
(c) Piperidine
(d) Pyrimidine
Option c – Piperidine
Which compound, when nitrated, does NOT form a meta-substituted product?
(a) Acetophenone
(b) Acetanilide
(c) Benzaldehyde
(d) Nitrobenzene
Option b – Acetanilide
Which of the following statements about benzene is accurate?
(a) It is considered a [14]-annulene.
(b) It does not decolorize bromine dissolved in carbon tetrachloride.
(c) It has a non-planar molecular structure.
(d) Benzene exhibits higher reactivity than alkenes and alkynes.
Option b – It does not decolorize bromine dissolved in carbon tetrachloride.
Identify the INCORRECT statement:
(a) Bromine is an electrophile.
(b) Chlorine attached to a benzene ring is an activating group and directs to ortho and para positions.
(c) Benzene is a flat molecule.
(d) Phenol reacts more readily than benzene in electrophilic substitution.
Option b – Chlorine attached to a benzene ring is an activating group and directs to ortho and para positions.
The transformation of benzene into glyoxal can be achieved using:
(a) Heating with hydrogen and nickel catalyst under pressure
(b) Reductive ozonolysis
(c) Oxidation with V₂O₅ at 773 K
(d) Etard’s reaction
Option b – Reductive ozonolysis
Which of the following compounds exhibits the highest reactivity in sulphonation reactions?
(a) Nitrobenzene
(b) Benzonitrile
(c) Phenol
(d) Benzoic acid
Option c – Phenol
Heating which compound through a red-hot iron tube at 873 K results in the formation of mesitylene?
(a) 3 molecules of acetylene
(b) 3 molecules of propyne
(c) 3 molecules of 2-butyne
(d) 2 molecules of propyne
Option b – 3 molecules of propyne
In the Wurtz-Fittig reaction between chlorobenzene and methyl chloride, compound ‘X’ is produced. Which of the following statements about ‘X’ is NOT correct?
(a) It is a benzenoid compound.
(b) It yields a simple aromatic carboxylic acid upon reaction with concentrated HNO₃.
(c) It is synthesized via aromatization of n-hexane.
(d) The substituent in ‘X’ is an ortho- and para-directing activator.
Option c – It is synthesized via aromatization of n-hexane.
What is the IUPAC name of benzylamine?
(a) Aminobenzene
(b) Phenylmethanamine
(c) 2-Aminotoluene
(d) N-Phenylaniline
Option b – Phenylmethanamine
Which of the following has a double bond that is conjugated with the benzene ring’s π-system?
(a) 4-Benzyltoluene
(b) 2-Phenyl-1-butene
(c) 3-Phenylcyclohexene
(d) 3-Phenyl-1,4-pentadiene
Option b – 2-Phenyl-1-butene
Treating nitrobenzene with concentrated HNO₃ and H₂SO₄ gives:
(a) 1,2-Dinitrobenzene
(b) 1,3-Dinitrobenzene
(c) 1,4-Dinitrobenzene
(d) 1,2,4-Trinitrobenzene
Option b – 1,3-Dinitrobenzene
Benzene can be produced by heating benzoic acid with compound X or phenol with compound Y. Identify X and Y.
(a) Zinc dust and soda lime
(b) Soda lime and zinc dust
(c) Zinc dust and sodium hydroxide
(d) Soda lime and copper
Option b – Soda lime and zinc dust
Lindane is commonly referred to as:
(a) DDT
(b) BHC
(c) Hexadeuterobenzene
(d) Trinitrotoluene
Option b – BHC
Choose the correct sequence showing decreasing reactivity towards electrophilic substitution:
i. 2,4-Dinitrochlorobenzene
ii. p-Nitrochlorobenzene
iii. Chlorobenzene
(a) Chlorobenzene > p-Nitrochlorobenzene > 2,4-Dinitrochlorobenzene
(b) 2,4-Dinitrochlorobenzene > p-Nitrochlorobenzene > Chlorobenzene
(c) p-Nitrochlorobenzene > Chlorobenzene > 2,4-Dinitrochlorobenzene
(d) Chlorobenzene > 2,4-Dinitrochlorobenzene > p-Nitrochlorobenzene
Option a – Chlorobenzene > p-Nitrochlorobenzene > 2,4-Dinitrochlorobenzene
Which of these compounds contains two benzene rings joined by a single bond and is aromatic?
(a) Diphenylmethane
(b) Diphenyl
(c) Naphthalene
(d) Azulene
Option b – Diphenyl
Assertion: Aromatic hydrocarbons produce more heat during combustion than alkanes.
Reason: Their cyclic structure with delocalized electrons makes them more stable than alkanes.
(a) Both the assertion and the reason are correct, and the reason explains the assertion.
(b) Both statements are true, but the reason is not the correct explanation.
(c) The assertion is correct, but the reason is incorrect.
(d) The assertion is incorrect, but the reason is correct.
Option d – The assertion is incorrect, but the reason is correct.
Which of the following is NOT true about the electrophilic substitution mechanism?
(a) Formation of the electrophile requires a Lewis or protonic acid.
(b) The aromaticity of benzene is lost during the reaction.
(c) Arenium ion formed is not aromatic.
(d) Proton removal by a nucleophile occurs in the mechanism.
Option b – The aromaticity of benzene is lost during the reaction.
Among the following compounds, identify the most reactive and least reactive towards electrophilic substitution, respectively:
2-Nitrophenol, 4-Bromophenol, Nitrobenzene, Phenol, 1,3-Dinitrobenzene
(a) Nitrobenzene and 4-Bromophenol
(b) 2-Nitrophenol and 4-Bromophenol
(c) 1,3-Dinitrobenzene and 4-Bromophenol
(d) Phenol and 1,3-Dinitrobenzene
Option d – Phenol and 1,3-Dinitrobenzene
Which of the following statements is false?
(a) Aromatic hydrocarbons produce a sooty flame when burned.
(b) Benzene decolorizes alkaline KMnO₄.
(c) Benzene can undergo halogenation like alkanes.
(d) Aromatic hydrocarbons contain more carbon than equivalent aliphatic compounds.
Option b – Benzene decolorizes alkaline KMnO₄.
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