{"id":206882,"date":"2025-04-16T17:42:51","date_gmt":"2025-04-16T17:42:51","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=206882"},"modified":"2025-04-16T17:43:08","modified_gmt":"2025-04-16T17:43:08","slug":"the-least-stable-conformation-of-cyclohexane","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/04\/16\/the-least-stable-conformation-of-cyclohexane\/","title":{"rendered":"The least stable conformation of cyclohexane"},"content":{"rendered":"\n<p>The least stable conformation of cyclohexane is the <\/p>\n\n\n\n<p>A) boat <\/p>\n\n\n\n<p>B) twist boat.<\/p>\n\n\n\n<p> C) Chair <\/p>\n\n\n\n<p>D) half-chair<\/p>\n\n\n\n<p> E) twist chair.<\/p>\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>The correct answer is: <strong>D) half-chair<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation (300 words):<\/h3>\n\n\n\n<p>Cyclohexane is a six-membered ring that adopts various conformations to minimize angle strain and torsional strain. Among these, the most well-known conformations are <strong>chair<\/strong>, <strong>boat<\/strong>, <strong>twist-boat<\/strong>, and <strong>half-chair<\/strong>. Each conformation has a different level of stability, primarily influenced by how well the molecule avoids eclipsing interactions and how close it stays to ideal bond angles (109.5\u00b0 for sp\u00b3 carbons).<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Chair conformation<\/strong> is the most stable due to complete staggered interactions and minimal angle strain. All carbon-carbon bonds are staggered, which minimizes torsional strain. This is the default, low-energy conformation for cyclohexane.<\/li>\n\n\n\n<li><strong>Boat conformation<\/strong> is less stable than chair because it introduces eclipsing interactions and steric hindrance between the two flagpole hydrogen atoms (those pointing toward each other at the top of the boat). However, there is no angle strain in the boat form.<\/li>\n\n\n\n<li><strong>Twist-boat conformation<\/strong> is slightly more stable than the boat because it relieves some torsional strain by twisting the boat shape, reducing eclipsing interactions.<\/li>\n\n\n\n<li><strong>Half-chair conformation<\/strong> is the <strong>least stable<\/strong> of all because it represents a high-energy transition state between chair and twist-boat forms. In this conformation, one carbon is lifted out of the plane, causing severe torsional and angle strain. It is not a stable, isolable form but rather an intermediate seen during ring flips and conformational changes.<\/li>\n\n\n\n<li><strong>Twist-chair<\/strong> is not a standard term in conformational analysis of cyclohexane, and likely a distractor in the list.<\/li>\n<\/ol>\n\n\n\n<p>Therefore, <strong>half-chair<\/strong> is the highest-energy, least stable conformation due to its combination of angle and torsional strain, making <strong>option D<\/strong> the correct choice.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/04\/image-93.png\" alt=\"\" class=\"wp-image-206883\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>The least stable conformation of cyclohexane is the A) boat B) twist boat. C) Chair D) half-chair E) twist chair. The correct answer and explanation is : The correct answer is: D) half-chair Explanation (300 words): Cyclohexane is a six-membered ring that adopts various conformations to minimize angle strain and torsional strain. Among these, the [&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-206882","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/206882","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=206882"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/206882\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=206882"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=206882"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=206882"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}