{"id":236909,"date":"2025-06-16T16:03:55","date_gmt":"2025-06-16T16:03:55","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=236909"},"modified":"2025-06-16T16:03:57","modified_gmt":"2025-06-16T16:03:57","slug":"consider-the-chirality-center-in-the-compound-below","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/16\/consider-the-chirality-center-in-the-compound-below\/","title":{"rendered":"Consider the chirality center in the compound below."},"content":{"rendered":"\n<p>Consider the chirality center in the compound below. What is the highest priority substituent group? (CH3)CCl Incorrect: C(OH)CH2CH3 Substituent priority is determined by atomic numbers, working outward from the chirality center. (CH3)Br -(CH3)CH(CH3)2 not by the highest total mass of the entire substituent group. OH OH What is the second highest priority substituent group? (CH3)CCl C(OH)CH2CH3 (CH3)Br -(CH3)CH(CH3)2<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-1-color\">The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p>To determine the <strong>priority of substituent groups<\/strong> attached to a chirality center, we use the <strong>Cahn-Ingold-Prelog (CIP) priority rules<\/strong>. These rules assign priority based on <strong>atomic number<\/strong>, not mass or bulk.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1: List the Substituents<\/h3>\n\n\n\n<p>Let\u2019s identify the first atoms directly attached to the chiral center in each group:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>(CH\u2083)CCl<\/strong><br>First atom: <strong>Carbon<\/strong> (C)<br>Attached to: <strong>Cl<\/strong>, <strong>CH\u2083<\/strong>, and <strong>H<\/strong><\/li>\n\n\n\n<li><strong>C(OH)CH\u2082CH\u2083<\/strong><br>First atom: <strong>Carbon<\/strong> (C)<br>Attached to: <strong>OH<\/strong>, <strong>CH\u2082CH\u2083<\/strong>, and <strong>H<\/strong><\/li>\n\n\n\n<li><strong>(CH\u2083)Br<\/strong><br>First atom: <strong>Carbon<\/strong> (C)<br>Attached to: <strong>Br<\/strong>, <strong>H<\/strong>, and <strong>CH\u2083<\/strong><\/li>\n\n\n\n<li><strong>(CH\u2083)CH(CH\u2083)\u2082<\/strong><br>First atom: <strong>Carbon<\/strong> (C)<br>Attached to: <strong>CH\u2083<\/strong>, <strong>CH\u2083<\/strong>, and <strong>CH(CH\u2083)<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Now apply the CIP rule:<br><strong>Step 2: Compare the atoms directly attached to the chiral center.<\/strong><\/p>\n\n\n\n<p>All first atoms are <strong>carbon<\/strong>, so we move to the atoms attached to these carbons:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>(CH\u2083)CCl<\/strong>: This carbon is bonded to <strong>Cl<\/strong>, which has an atomic number of <strong>17<\/strong>. Highest among all.<\/li>\n\n\n\n<li><strong>(CH\u2083)Br<\/strong>: The carbon is bonded to <strong>Br<\/strong> (atomic number <strong>35<\/strong>) \u2014 highest so far.<\/li>\n\n\n\n<li><strong>C(OH)CH\u2082CH\u2083<\/strong>: The carbon is bonded to <strong>OH<\/strong> (Oxygen has atomic number <strong>8<\/strong>) \u2014 lower than Cl and Br.<\/li>\n\n\n\n<li><strong>(CH\u2083)CH(CH\u2083)\u2082<\/strong>: This carbon is bonded only to other carbons and hydrogens \u2014 no heteroatoms.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Final Priority Ranking:<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>(CH\u2083)Br<\/strong> \u2013 due to Br (atomic number 35)<\/li>\n\n\n\n<li><strong>(CH\u2083)CCl<\/strong> \u2013 due to Cl (atomic number 17)<\/li>\n\n\n\n<li><strong>C(OH)CH\u2082CH\u2083<\/strong> \u2013 due to OH (Oxygen, atomic number 8)<\/li>\n\n\n\n<li><strong>(CH\u2083)CH(CH\u2083)\u2082<\/strong> \u2013 only carbon and hydrogen attached<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Correct Answers:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Highest priority substituent<\/strong>: <strong>(CH\u2083)Br<\/strong><\/li>\n\n\n\n<li><strong>Second highest priority substituent<\/strong>: <strong>(CH\u2083)CCl<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation Summary:<\/h3>\n\n\n\n<p>Substituent priority is not about the total weight or size of the group. It is determined by the <strong>atomic number of atoms directly bonded<\/strong> to the chiral center, and if necessary, by atoms in the next bonding layer. Using this rule, <strong>(CH\u2083)Br<\/strong> takes the top spot due to the bromine atom\u2019s high atomic number, followed by <strong>(CH\u2083)CCl<\/strong> with chlorine.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/06\/learnexams-banner8-760.jpeg\" alt=\"\" class=\"wp-image-236910\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Consider the chirality center in the compound below. What is the highest priority substituent group? (CH3)CCl Incorrect: C(OH)CH2CH3 Substituent priority is determined by atomic numbers, working outward from the chirality center. (CH3)Br -(CH3)CH(CH3)2 not by the highest total mass of the entire substituent group. OH OH What is the second highest priority substituent group? (CH3)CCl [&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-236909","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/236909","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=236909"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/236909\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=236909"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=236909"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=236909"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}