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Hydrocarbons
Aromatic Hydrocarbons – Electrophilic Substitution
1 question from 1 paper, each with its answer.
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- 1
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- years asked, 2017–2026
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- of Hydrocarbons
- 1.33%
Concepts tested
- identifying an electrophilic substitution reaction
All Questions
2019 1 question
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Among the following, the reaction that proceeds through an electrophilic substitution is:Chlorination of benzene with $Cl_2$ in presence of anhydrous $AlCl_3$ proceeds through electrophilic substitution: $C_6H_6+Cl_2\xrightarrow{AlCl_3}C_6H_5Cl+HCl$ Generation of electrophile: $Cl-Cl+AlCl_3\rightarrow Cl^++AlCl_4^-$ $Cl^+$ attacks the benzene ring to form the arenium ion (σ-complex), which loses $H^+$ to give chlorobenzene. (The Sandmeyer reaction is not an electrophilic substitution, $Cl_2$/UV light gives an addition product, and $C_6H_5CH_2OH$ + HCl is nucleophilic substitution.)