{"id":263660,"date":"2025-07-21T08:18:45","date_gmt":"2025-07-21T08:18:45","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=263660"},"modified":"2025-07-21T08:18:47","modified_gmt":"2025-07-21T08:18:47","slug":"name-the-alkene","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/21\/name-the-alkene\/","title":{"rendered":"Name the alkene"},"content":{"rendered":"\n

Name the alkene: CH3CH2CH=CH2<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n

2-methylpent-1-ene<\/strong><\/p>\n\n\n\n

To determine the correct IUPAC name for the alkene shown, we must follow a systematic set of rules.<\/p>\n\n\n\n

    \n
  1. Identify the Parent Chain:<\/strong>\u00a0The first and most crucial step is to find the longest continuous carbon chain that incorporates both carbons of the carbon-carbon double bond (C=C). The structure in the image is CH\u2083-CH\u2082-CH\u2082-C(=CH\u2082)-CH\u2083. The double bond involves the central carbon atom and the CH\u2082 group attached to it.\n
      \n
    • One possible chain containing the double bond is CH\u2082=C-CH\u2083. This chain is only three carbons long.<\/li>\n\n\n\n
    • A longer chain can be traced from the double bond into the propyl group: CH\u2082=C-CH\u2082-CH\u2082-CH\u2083. This chain is five carbons long.
      According to IUPAC rules, we must choose the longest chain, which is the five-carbon chain. Therefore, the base name of the molecule is derived from “pentane,” making it a “pentene.”<\/li>\n<\/ul>\n<\/li>\n\n\n\n
    • Number the Parent Chain:<\/strong>\u00a0The parent chain must be numbered to give the carbons of the double bond the lowest possible locants (positions). The five-carbon chain is CH\u2082=C-CH\u2082-CH\u2082-CH\u2083. To give the double bond the lowest number, we must start numbering from the end closest to it. In this case, we start from the =CH\u2082 group.\n
        \n
      • The =CH\u2082 carbon is C1.<\/li>\n\n\n\n
      • The next carbon in the double bond is C2.<\/li>\n\n\n\n
      • The rest of the chain follows: -CH\u2082(C3)-CH\u2082(C4)-CH\u2083(C5).
        Since the double bond starts at C1, the parent alkene is named\u00a0pent-1-ene<\/strong>.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
      • Identify and Locate Substituents:<\/strong>\u00a0After identifying and numbering the parent chain, we look for any alkyl groups (substituents) attached to it. In the given structure, there is a methyl group (-CH\u2083) attached to the C2 position of our numbered parent chain. Therefore, the substituent is identified as\u00a02-methyl<\/strong>.<\/li>\n\n\n\n
      • Assemble the Full Name:<\/strong>\u00a0The final IUPAC name is constructed by combining the substituent name and location with the parent alkene name. The standard format is: (substituent location)-(substituent name)(parent name).
        Putting the pieces together, we get\u00a02-methylpent-1-ene<\/strong>.<\/li>\n<\/ol>\n\n\n\n
        \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

        Name the alkene: CH3CH2CH=CH2 The Correct Answer and Explanation is: 2-methylpent-1-ene To determine the correct IUPAC name for the alkene shown, we must follow a systematic set of rules.<\/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-263660","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/263660","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=263660"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/263660\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=263660"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=263660"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=263660"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}