{"id":230366,"date":"2025-06-09T11:08:28","date_gmt":"2025-06-09T11:08:28","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=230366"},"modified":"2025-06-09T11:08:59","modified_gmt":"2025-06-09T11:08:59","slug":"which-of-the-following-is-not-a-valid-lewis-structure-for-the-molecular-formula-c2h6n","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/09\/which-of-the-following-is-not-a-valid-lewis-structure-for-the-molecular-formula-c2h6n\/","title":{"rendered":"Which of the following is NOT a valid Lewis structure for the molecular formula C2H6N"},"content":{"rendered":"\n

Which of the following is NOT a valid Lewis structure for the molecular formula C2H6N? A: H – C – C = N – H (with H atoms and a positive charge on C) B: H – C = C – N – H (with H atoms and a negative charge on N) C: H2 – C – (C with positive charge) – N – H2 (with H atoms) D: H – C – N = C – H (with H atoms and two charges)<\/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 answer is: A<\/strong><\/p>\n\n\n\n

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

To determine which structure is NOT<\/strong> a valid Lewis structure for the molecular formula C\u2082H\u2086N<\/strong>, we need to evaluate each structure based on:<\/p>\n\n\n\n

    \n
  1. Octet rule<\/strong> for atoms (especially carbon and nitrogen),<\/li>\n\n\n\n
  2. Correct number of valence electrons<\/strong>,<\/li>\n\n\n\n
  3. Formal charges<\/strong>, and<\/li>\n\n\n\n
  4. Total atom count<\/strong>: 2 carbon (C), 6 hydrogen (H), and 1 nitrogen (N).<\/li>\n<\/ol>\n\n\n\n
    \n\n\n\n

    Option A<\/strong>:<\/h4>\n\n\n\n

    Structure shows a carbon atom forming five bonds<\/strong> \u2014 one single bond with hydrogen, two single bonds with adjacent carbon and hydrogen, and a double bond with nitrogen<\/strong> while also holding a positive formal charge<\/strong>.<\/p>\n\n\n\n

      \n
    • Problem<\/strong>: Carbon cannot have five bonds<\/strong> (10 electrons), as it violates the octet rule<\/strong>.<\/li>\n\n\n\n
    • Conclusion<\/strong>: \u274c Invalid Lewis structure<\/strong><\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n

      Option B<\/strong>:<\/h4>\n\n\n\n
        \n
      • The molecule has two carbon atoms, and nitrogen is attached to one carbon and a hydrogen, carrying a negative charge<\/strong>.<\/li>\n\n\n\n
      • All atoms obey the octet rule<\/strong>, and the total number of atoms matches C\u2082H\u2086N<\/strong>.<\/li>\n\n\n\n
      • Formal charges are plausible.<\/li>\n\n\n\n
      • Conclusion<\/strong>: \u2705 Valid<\/strong><\/li>\n<\/ul>\n\n\n\n
        \n\n\n\n

        Option C<\/strong>:<\/h4>\n\n\n\n
          \n
        • The central carbon has a positive charge<\/strong>, nitrogen is neutral.<\/li>\n\n\n\n
        • Atom counts and bonding obey valence and octet rules.<\/li>\n\n\n\n
        • All atoms appear correctly bonded with correct charges.<\/li>\n\n\n\n
        • Conclusion<\/strong>: \u2705 Valid<\/strong><\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n

          Option D<\/strong>:<\/h4>\n\n\n\n
            \n
          • Carbon and nitrogen are correctly arranged.<\/li>\n\n\n\n
          • The nitrogen forms three bonds<\/strong> and a lone pair, carbon maintains four bonds, and the formal charges are plausible.<\/li>\n\n\n\n
          • Atom count and electron rules are satisfied.<\/li>\n\n\n\n
          • Conclusion<\/strong>: \u2705 Valid<\/strong><\/li>\n<\/ul>\n\n\n\n
            \n\n\n\n

            Final Answer: \u2705 A is NOT a valid Lewis structure<\/strong> because it violates the octet rule<\/strong> for carbon, making it chemically implausible despite matching the molecular formula C\u2082H\u2086N.<\/h3>\n\n\n\n
            \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

            Which of the following is NOT a valid Lewis structure for the molecular formula C2H6N? A: H – C – C = N – H (with H atoms and a positive charge on C) B: H – C = C – N – H (with H atoms and a negative charge on N) C: H2 […]<\/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-230366","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/230366","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=230366"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/230366\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=230366"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=230366"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=230366"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}