{"id":188889,"date":"2025-02-07T17:44:24","date_gmt":"2025-02-07T17:44:24","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=188889"},"modified":"2025-02-07T17:44:26","modified_gmt":"2025-02-07T17:44:26","slug":"rank-the-following-carbocations-in-decreasing-order-of-stability","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/02\/07\/rank-the-following-carbocations-in-decreasing-order-of-stability\/","title":{"rendered":"Rank the following carbocations in decreasing order of stability"},"content":{"rendered":"\n<p>Rank the following carbocations in decreasing order of stability. Classify each as primary, secondary, or tertiary.<\/p>\n\n\n\n<p>(a) The isopentyl cation, <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/02\/image-153.png\" alt=\"\" class=\"wp-image-188890\"\/><\/figure>\n\n\n\n<p>(b) The 3-methyl-2-butyl cation, <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/02\/image-154.png\" alt=\"\" class=\"wp-image-188891\"\/><\/figure>\n\n\n\n<p>(c) The 2-methyl-2-butyl cation, <\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/02\/image-155.png\" alt=\"\" class=\"wp-image-188892\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/02\/image-156.png\" alt=\"\" class=\"wp-image-188893\"\/><\/figure>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The Correct Answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>To rank the given carbocations in decreasing order of stability and classify each as primary, secondary, or tertiary, we need to analyze their structures and the factors influencing carbocation stability.<\/p>\n\n\n\n<p><strong>Carbocation Stability Factors:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Inductive Effect:<\/strong> Electron-donating groups (like alkyl groups) stabilize carbocations by donating electron density through sigma bonds.<\/li>\n\n\n\n<li><strong>Resonance Stabilization:<\/strong> Delocalization of the positive charge over multiple atoms through resonance structures enhances stability.<\/li>\n\n\n\n<li><strong>Hyperconjugation:<\/strong> Interaction between the empty p-orbital of the carbocation and adjacent C-H or C-C sigma bonds provides additional stabilization.<\/li>\n<\/ol>\n\n\n\n<p><strong>Analysis of Each Carbocation:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Isopentyl Cation (a):<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Structure:<\/strong> The isopentyl group is a branched alkyl group with the structure (CH\u2083)\u2082CHCH\u2082CH\u2082\u2013.<\/li>\n\n\n\n<li><strong>Classification:<\/strong> This carbocation is <strong>primary<\/strong> because the positively charged carbon is attached to only one other carbon.<\/li>\n\n\n\n<li><strong>Stability:<\/strong> Primary carbocations are generally less stable due to minimal inductive stabilization and lack of resonance.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>3-Methyl-2-butyl Cation (b):<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Structure:<\/strong> This cation has the structure CH\u2083\u2013CH\u2082\u2013C\u207a(CH\u2083)\u2013CH\u2083.<\/li>\n\n\n\n<li><strong>Classification:<\/strong> The positively charged carbon is attached to two other carbons, making it a <strong>secondary<\/strong> carbocation.<\/li>\n\n\n\n<li><strong>Stability:<\/strong> Secondary carbocations are more stable than primary ones due to increased inductive stabilization from adjacent alkyl groups.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>2-Methyl-2-butyl Cation (c):<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Structure:<\/strong> This cation has the structure (CH\u2083)\u2083C\u207a\u2013CH\u2082\u2013CH\u2083.<\/li>\n\n\n\n<li><strong>Classification:<\/strong> The positively charged carbon is attached to three other carbons, classifying it as a <strong>tertiary<\/strong> carbocation.<\/li>\n\n\n\n<li><strong>Stability:<\/strong> Tertiary carbocations are the most stable among the three due to significant inductive stabilization from three alkyl groups and potential hyperconjugation.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><strong>Ranking in Decreasing Order of Stability:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>2-Methyl-2-butyl Cation (c):<\/strong> Tertiary carbocation with maximum inductive stabilization.<\/li>\n\n\n\n<li><strong>3-Methyl-2-butyl Cation (b):<\/strong> Secondary carbocation with moderate stability.<\/li>\n\n\n\n<li><strong>Isopentyl Cation (a):<\/strong> Primary carbocation with minimal stabilization.<\/li>\n<\/ol>\n\n\n\n<p>In summary, the stability of carbocations increases with the number of alkyl groups attached to the positively charged carbon, due to enhanced inductive effects and potential hyperconjugation.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Rank the following carbocations in decreasing order of stability. Classify each as primary, secondary, or tertiary. (a) The isopentyl cation, (b) The 3-methyl-2-butyl cation, (c) The 2-methyl-2-butyl cation, The Correct Answer and Explanation is : To rank the given carbocations in decreasing order of stability and classify each as primary, secondary, or tertiary, we need [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-188889","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/188889","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=188889"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/188889\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=188889"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=188889"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=188889"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}