{"id":87020,"date":"2025-06-01T04:26:23","date_gmt":"2025-06-01T04:26:23","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87020"},"modified":"2025-06-01T04:26:23","modified_gmt":"2025-06-01T04:26:23","slug":"the-electrophile-generated-in-sulphonation-of-benzene-from-fuming-sulp","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-electrophile-generated-in-sulphonation-of-benzene-from-fuming-sulp\/","title":{"rendered":"The electrophile generated in sulphonation of benzene from fuming sulp"},"content":{"rendered":"

The electrophile generated in sulphonation of benzene from fuming sulphuric acid is<\/p>\n

[amp_mcq option1=”SO\u2083\u207a” option2=”SO\u2083H” option3=”SO\u2083” option4=”SO\u2082H” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC Geoscientist – 2023<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nSulphonation of benzene is an electrophilic aromatic substitution reaction. When fuming sulfuric acid (H\u2082SO\u2084 containing dissolved SO\u2083) is used, the active electrophile is sulfur trioxide (SO\u2083). SO\u2083 is a highly electron-deficient species due to the electron-withdrawing nature of the oxygen atoms and the formal positive charge on sulfur (though it can be considered neutral overall with resonance structures). It is sufficiently electrophilic to attack the pi electron system of the benzene ring.
\n<\/section>\n
\nThe electrophile in the sulphonation of benzene by fuming sulfuric acid is SO\u2083.
\n<\/section>\n
\nIn concentrated sulfuric acid without fuming (less SO\u2083), the electrophile is still primarily SO\u2083, generated from the equilibrium 2H\u2082SO\u2084 \u21cc H\u2083O\u207a + HSO\u2084\u207b + SO\u2083. However, fuming sulfuric acid has a much higher concentration of SO\u2083, making the reaction faster. SO\u2083H and SO\u2082H are not the active electrophilic species attacking the benzene ring.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

The electrophile generated in sulphonation of benzene from fuming sulphuric acid is [amp_mcq option1=”SO\u2083\u207a” option2=”SO\u2083H” option3=”SO\u2083” option4=”SO\u2082H” correct=”option3″] This question was previously asked in UPSC Geoscientist – 2023 Download PDFAttempt Online Sulphonation of benzene is an electrophilic aromatic substitution reaction. When fuming sulfuric acid (H\u2082SO\u2084 containing dissolved SO\u2083) is used, the active electrophile is sulfur … <\/p>\n

Detailed SolutionThe electrophile generated in sulphonation of benzene from fuming sulp<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1091],"tags":[1105,1096,1272],"class_list":["post-87020","post","type-post","status-publish","format-standard","hentry","category-upsc-geoscientist","tag-1105","tag-chemistry","tag-organic-chemistry","no-featured-image-padding"],"yoast_head":"\nThe electrophile generated in sulphonation of benzene from fuming sulp<\/title>\n<meta name=\"description\" content=\"Sulphonation of benzene is an electrophilic aromatic substitution reaction. When fuming sulfuric acid (H\u2082SO\u2084 containing dissolved SO\u2083) is used, the active electrophile is sulfur trioxide (SO\u2083). SO\u2083 is a highly electron-deficient species due to the electron-withdrawing nature of the oxygen atoms and the formal positive charge on sulfur (though it can be considered neutral overall with resonance structures). It is sufficiently electrophilic to attack the pi electron system of the benzene ring. The electrophile in the sulphonation of benzene by fuming sulfuric acid is SO\u2083.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/the-electrophile-generated-in-sulphonation-of-benzene-from-fuming-sulp\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The electrophile generated in sulphonation of benzene from fuming sulp\" \/>\n<meta property=\"og:description\" content=\"Sulphonation of benzene is an electrophilic aromatic substitution reaction. When fuming sulfuric acid (H\u2082SO\u2084 containing dissolved SO\u2083) is used, the active electrophile is sulfur trioxide (SO\u2083). SO\u2083 is a highly electron-deficient species due to the electron-withdrawing nature of the oxygen atoms and the formal positive charge on sulfur (though it can be considered neutral overall with resonance structures). It is sufficiently electrophilic to attack the pi electron system of the benzene ring. The electrophile in the sulphonation of benzene by fuming sulfuric acid is SO\u2083.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/the-electrophile-generated-in-sulphonation-of-benzene-from-fuming-sulp\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T04:26:23+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"The electrophile generated in sulphonation of benzene from fuming sulp","description":"Sulphonation of benzene is an electrophilic aromatic substitution reaction. 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When fuming sulfuric acid (H\u2082SO\u2084 containing dissolved SO\u2083) is used, the active electrophile is sulfur trioxide (SO\u2083). SO\u2083 is a highly electron-deficient species due to the electron-withdrawing nature of the oxygen atoms and the formal positive charge on sulfur (though it can be considered neutral overall with resonance structures). It is sufficiently electrophilic to attack the pi electron system of the benzene ring. 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