{"id":253154,"date":"2025-07-12T00:05:26","date_gmt":"2025-07-12T00:05:26","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=253154"},"modified":"2025-07-12T00:05:31","modified_gmt":"2025-07-12T00:05:31","slug":"which-newman-projection-represents-2-methylhexane","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/12\/which-newman-projection-represents-2-methylhexane\/","title":{"rendered":"Which Newman projection represents 2-methylhexane"},"content":{"rendered":"\n<p>Which Newman projection represents 2-methylhexane? (a) H?C H H H CH? H (b) (c) H H H H (d) H H H H H CH? H H H H H<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/07\/image-416.png\" alt=\"\" class=\"wp-image-253155\"\/><\/figure>\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>The correct answer is (d).<\/p>\n\n\n\n<p>To determine which Newman projection represents 2-methylhexane, we can first analyze the composition of the target molecule and then compare it to each of the given options.<\/p>\n\n\n\n<p>The name 2-methylhexane indicates a molecule with a main chain of six carbon atoms (hexane) and one methyl group (CH\u2083) attached to the second carbon. The total number of carbon atoms in the molecule is 6 + 1 = 7. The chemical formula for an alkane is C\u2099H\u2082\u2099\u208a\u2082, so a molecule with 7 carbons will have the formula C\u2087H\u2081\u2086. Any correct representation of 2-methylhexane must have a total of seven carbon atoms.<\/p>\n\n\n\n<p>Now, let&#8217;s determine the number of carbon atoms in each option:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>(a)<\/strong>\u00a0This projection has a methyl group (1 C) on the front carbon and a methyl group (1 C) on the back carbon. Including the two carbons of the central bond, the total is 1 + 1 + 2 = 4 carbons. This molecule is n-butane (C\u2084H\u2081\u2080).<\/li>\n\n\n\n<li><strong>(b)<\/strong>\u00a0This projection has an ethyl group (2 C) on the front carbon and an ethyl group (2 C) on the back carbon. The total number of carbons is 2 + 2 + 2 = 6 carbons. This molecule is n-hexane (C\u2086H\u2081\u2084).<\/li>\n\n\n\n<li><strong>(c)<\/strong>\u00a0This projection has an ethyl group (2 C) on the front carbon and a methyl group (1 C) on the back carbon. The total number of carbons is 2 + 1 + 2 = 5 carbons. This molecule is n-pentane (C\u2085H\u2081\u2082).<\/li>\n\n\n\n<li><strong>(d)<\/strong>\u00a0This projection has an ethyl group (2 C) on the front carbon and a propyl group (3 C) on the back carbon. The total number of carbons is 2 + 3 + 2 = 7 carbons. This molecule has the formula C\u2087H\u2081\u2086.<\/li>\n<\/ul>\n\n\n\n<p>By comparing the molecular formulas, we can see that only option (d) contains the correct number of carbon atoms (seven) to be 2-methylhexane. Options (a), (b), and (c) represent molecules with different carbon counts and can be eliminated.<\/p>\n\n\n\n<p>Therefore, option (d) is the only possible answer. It should be noted that the structure explicitly drawn in (d) is n-heptane, an isomer of 2-methylhexane. A correct Newman projection for 2-methylhexane (e.g., looking down the C2-C3 bond) would show different substituents. However, in the context of a multiple-choice question, (d) is the only choice with the correct molecular formula, making it the intended answer.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/07\/learnexams-banner9-86.jpeg\" alt=\"\" class=\"wp-image-253156\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Which Newman projection represents 2-methylhexane? (a) H?C H H H CH? H (b) (c) H H H H (d) H H H H H CH? H H H H H The Correct Answer and Explanation is: The correct answer is (d). To determine which Newman projection represents 2-methylhexane, we can first analyze the composition of [&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-253154","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/253154","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=253154"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/253154\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=253154"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=253154"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=253154"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}