Asked in PMC Practice Test 19 (2021) 2021Moderate

How many products of mono-substituted benzene are possible?

Correct answer: B. One

  • A. Two
  • B. One
  • C. Three
  • D. None of these

Explanation

Benzene can form only one type of monosubstituted means that it cannot form different atoms just by replacing the position of the attached atom like in ortho, para or meta position which occurs when two atoms are attached to it. Hence it forms only one type of monosubstituted product. Monosubstituted benzene does not show any isomer because all the five hydrogens attached to carbon atoms are identical. Disubstituted benzene exhibit position isomerism.

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About Benzene and Aromatic Compounds

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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