{"id":224099,"date":"2025-06-02T17:34:09","date_gmt":"2025-06-02T17:34:09","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=224099"},"modified":"2025-06-02T17:34:11","modified_gmt":"2025-06-02T17:34:11","slug":"select-the-correct-iupac-name-for-the-branched-chain-alkane","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/02\/select-the-correct-iupac-name-for-the-branched-chain-alkane\/","title":{"rendered":"Select the correct IUPAC name for the branched chain alkane."},"content":{"rendered":"\n

Select the correct IUPAC name for the branched chain alkane. The name is: 3-propyl-5-ethyl-7-methyloctane 4-ethyl-6-ethyl-8-methylnonane 2-methyl-4,6-diethylnonane 4,6-diethyl-2-methylnonane<\/p>\n\n\n\n

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

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

Correct IUPAC Name:<\/h3>\n\n\n\n

2-methyl-4,6-diethylnonane<\/strong><\/p>\n\n\n\n

\n\n\n\n

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

To determine the correct IUPAC name of the given branched alkane, we need to follow the IUPAC rules for naming alkanes:<\/p>\n\n\n\n

1. Find the longest continuous carbon chain:<\/strong><\/h4>\n\n\n\n

From the image, the longest continuous carbon chain contains 9 carbon atoms<\/strong>, so the parent hydrocarbon is nonane<\/strong>.<\/p>\n\n\n\n

2. Number the chain to give the lowest numbers to the substituents:<\/strong><\/h4>\n\n\n\n

We must number the chain from the end closest to the first branch. Starting from the left side gives substituent positions at 2, 4, and 6<\/strong>, which are lower than numbering from the right.<\/p>\n\n\n\n

3. Identify the substituents:<\/strong><\/h4>\n\n\n\n
    \n
  • At carbon 2<\/strong>, there is a methyl group<\/strong> (\u2013CH\u2083).<\/li>\n\n\n\n
  • At carbon 4<\/strong>, there is an ethyl group<\/strong> (\u2013CH\u2082CH\u2083).<\/li>\n\n\n\n
  • At carbon 6<\/strong>, there is another ethyl group<\/strong>.<\/li>\n<\/ul>\n\n\n\n

    This gives us:<\/p>\n\n\n\n

      \n
    • One methyl group at position 2.<\/li>\n\n\n\n
    • Two ethyl groups at positions 4 and 6.<\/li>\n<\/ul>\n\n\n\n

      4. Assemble the name:<\/strong><\/h4>\n\n\n\n

      We use alphabetical order for substituents in the name:<\/p>\n\n\n\n

        \n
      • Ethyl comes before methyl.<\/li>\n\n\n\n
      • Two ethyl groups = diethyl<\/strong> \u2192 specify locations as 4,6-diethyl<\/strong>.<\/li>\n\n\n\n
      • One methyl group at position 2 = 2-methyl<\/strong>.<\/li>\n<\/ul>\n\n\n\n

        Putting it all together:
        2-methyl-4,6-diethylnonane<\/strong><\/p>\n\n\n\n

        5. Verify the options:<\/strong><\/h4>\n\n\n\n
          \n
        • Option A<\/strong>: Incorrect carbon count (octane = 8 C atoms).<\/li>\n\n\n\n
        • Option B<\/strong>: Redundant \u201cethyl-ethyl\u201d listing, and numbering incorrect.<\/li>\n\n\n\n
        • Option C<\/strong>: \u2705 Correct \u2013 matches our derived name.<\/li>\n\n\n\n
        • Option D<\/strong>: Same name as C, but substituents not in proper alphabetical order.<\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n

          \u2705 Final Answer: 2-methyl-4,6-diethylnonane<\/strong><\/h3>\n\n\n\n
          \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

          Select the correct IUPAC name for the branched chain alkane. The name is: 3-propyl-5-ethyl-7-methyloctane 4-ethyl-6-ethyl-8-methylnonane 2-methyl-4,6-diethylnonane 4,6-diethyl-2-methylnonane The Correct Answer and Explanation is: Correct IUPAC Name: 2-methyl-4,6-diethylnonane Explanation To determine the correct IUPAC name of the given branched alkane, we need to follow the IUPAC rules for naming alkanes: 1. Find the longest continuous carbon […]<\/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-224099","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/224099","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=224099"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/224099\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=224099"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=224099"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=224099"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}