{"id":263650,"date":"2025-07-21T08:14:26","date_gmt":"2025-07-21T08:14:26","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=263650"},"modified":"2025-07-21T08:14:29","modified_gmt":"2025-07-21T08:14:29","slug":"give-the-correct-iupac-name-for-the-following-compound","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/07\/21\/give-the-correct-iupac-name-for-the-following-compound\/","title":{"rendered":"Give the correct IUPAC name for the following compound"},"content":{"rendered":"\n

Give the correct IUPAC name for the following compound: CH3CH=CH2 CH3CH2CH=CH2 A. 1,1-dimethylpropene B. 3-methyl-2-pentene C. 2-ethyl-2-butene D. Hexyne FC=CH3<\/p>\n\n\n\n

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

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

The correct IUPAC name for the given compound is B. 3-methyl-2-pentene<\/strong>.<\/p>\n\n\n\n

Explanation:<\/h3>\n\n\n\n

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

    \n
  1. Identify the Parent Chain:<\/strong>\u00a0The first step is to find the longest continuous chain of carbon atoms that includes the double bond. In the provided structure,\u00a0CH3\u2013CH=C(CH3)(CH2CH3), the longest carbon chain that contains the C=C double bond is five carbons long (CH3\u2013CH=C\u2013CH2\u2013CH3). Therefore, the parent name is derived from “pentane,” and because it’s an alkene (contains a double bond), the suffix becomes “-ene.” The parent name is\u00a0pentene<\/strong>.<\/li>\n\n\n\n
  2. Number the Parent Chain:<\/strong>\u00a0The chain must be numbered to give the carbon atoms of the double bond the lowest possible numbers.\n
      \n
    • Numbering from left to right:\u00a0C1H3\u2013C2H=C3(CH3)\u2013C4H2\u2013C5H3. The double bond starts at carbon 2.<\/li>\n\n\n\n
    • Numbering from right to left:\u00a0C5H3\u2013C4H2\u2013C3(CH3)=C2H\u2013C1H3. The double bond would start at carbon 3.
      Since 2 is lower than 3, we number the chain from left to right. This makes the compound a\u00a02-pentene<\/strong>.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
    • Identify and Name Substituents:<\/strong>\u00a0Now, we identify any groups attached to the parent chain. Using the correct numbering (from left to right), there is a methyl group (\u2013CH3) attached to carbon 3. So, the substituent is named\u00a03-methyl<\/strong>.<\/li>\n\n\n\n
    • Assemble the Full Name:<\/strong>\u00a0Finally, we combine the parts into a single name. The substituent name and its position are placed before the parent chain name. This gives us the final IUPAC name:\u00a03-methyl-2-pentene<\/strong>.<\/li>\n<\/ol>\n\n\n\n

      Analysis of Other Options:<\/strong><\/p>\n\n\n\n

        \n
      • A. 1,1-dimethyl-propene:<\/strong>\u00a0This name is invalid. The parent chain is pentene, not propene.<\/li>\n\n\n\n
      • C. 2-ethyl-2-butene:<\/strong>\u00a0This name incorrectly identifies the parent chain. While a four-carbon chain (butene) exists, the IUPAC rules require using the longest possible chain that includes the double bond, which is five carbons.<\/li>\n\n\n\n
      • D. Hexyne:<\/strong>\u00a0This is incorrect. The molecule has a double bond (it’s an alkene, not an alkyne with a triple bond) and its longest chain has five carbons, not six (hex-).<\/li>\n<\/ul>\n\n\n\n
        \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

        Give the correct IUPAC name for the following compound: CH3CH=CH2 CH3CH2CH=CH2 A. 1,1-dimethylpropene B. 3-methyl-2-pentene C. 2-ethyl-2-butene D. Hexyne FC=CH3 The Correct Answer and Explanation is: The correct IUPAC name for the given compound is B. 3-methyl-2-pentene. Explanation: To determine the correct IUPAC name for an alkene, we follow a set of systematic rules: Analysis of […]<\/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-263650","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/263650","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=263650"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/263650\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=263650"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=263650"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=263650"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}