{"id":218850,"date":"2025-05-24T14:28:22","date_gmt":"2025-05-24T14:28:22","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=218850"},"modified":"2025-05-24T14:28:25","modified_gmt":"2025-05-24T14:28:25","slug":"indicate-whether-or-not-the-following-molecules-are-chiral-17","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/24\/indicate-whether-or-not-the-following-molecules-are-chiral-17\/","title":{"rendered":"Indicate whether or not the following molecules are chiral."},"content":{"rendered":"\n
Indicate whether or not the following molecules are chiral.<\/p>\n\n\n\n
4-Methylheptane<\/strong> \u2014 Not chiral<\/strong><\/li>\n<\/ol>\n\n\n\n\n\n\n\n
Explanation:<\/h3>\n\n\n\n
Chirality in organic molecules occurs when a carbon atom is attached to four different substituents, creating a chiral center<\/strong> or stereocenter<\/strong>. Such a carbon atom lacks a plane of symmetry, and the molecule cannot be superimposed on its mirror image. This is key to chirality.<\/p>\n\n\n\n
Let’s analyze each molecule based on this:<\/p>\n\n\n\n
1. 3,3-Dimethylheptane<\/strong> This molecule has two identical methyl groups attached to carbon 3. Because carbon 3 has two identical groups, it cannot be a chiral center (it does not have four different groups). Also, no other carbon in the molecule has four distinct groups attached, so the molecule is achiral<\/strong>.<\/p>\n\n\n\n
2. 2,3-Dimethylheptane<\/strong> At carbon 2, there is a methyl substituent, and at carbon 3, there is a methyl substituent. Carbon 2 is attached to four different groups: a hydrogen, a methyl group, and two alkyl groups differing due to the position of methyl at carbon 3 and the rest of the chain. Similarly, carbon 3 also has four different groups. This molecule has at least one chiral center, so it is chiral<\/strong>.<\/p>\n\n\n\n
3. 2-Methylheptane<\/strong> The methyl substituent on carbon 2 creates a carbon with four different groups attached (a hydrogen, a methyl, and two different alkyl chains on either side). Hence, carbon 2 is a stereocenter, and the molecule is chiral<\/strong>.<\/p>\n\n\n\n
4. 3-Methylheptane<\/strong> Similarly, the methyl group on carbon 3 generates a carbon with four different substituents: hydrogen, methyl, and two different alkyl chains (parts of the heptane chain on either side). This makes carbon 3 a chiral center. So, the molecule is chiral<\/strong>.<\/p>\n\n\n\n
5. 4-Methylheptane<\/strong> The methyl substituent is exactly in the middle of the chain. Due to symmetry, carbon 4 does not have four different groups attached. The groups on either side of carbon 4 are identical, making this molecule achiral<\/strong>.<\/p>\n\n\n\n\n\n\n\n
Summary:<\/strong> Chirality arises from having at least one carbon with four different substituents. Molecules 2, 3, and 4 have such centers and are chiral. Molecules 1 and 5 lack such a center due to identical substituents or symmetry, so they are achiral.<\/p>\n\n\n\n<\/figure>\n","protected":false},"excerpt":{"rendered":"
Indicate whether or not the following molecules are chiral. 3,3-dimethylheptane2,3-dimethylheptane2-methylheptane3-methylheptane4-methylheptane The Correct Answer and Explanation is: Answers: Explanation: Chirality in organic molecules occurs when a carbon atom is attached to four different substituents, creating a chiral center or stereocenter. Such a carbon atom lacks a plane of symmetry, and the molecule cannot be superimposed on […]<\/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-218850","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/218850","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=218850"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/218850\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=218850"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=218850"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=218850"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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