{"id":230933,"date":"2025-06-10T08:30:46","date_gmt":"2025-06-10T08:30:46","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=230933"},"modified":"2025-06-10T08:30:48","modified_gmt":"2025-06-10T08:30:48","slug":"conjugate-base-of-b-is-more-stable-than-conjugate-acid-of-a","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/06\/10\/conjugate-base-of-b-is-more-stable-than-conjugate-acid-of-a\/","title":{"rendered":"Conjugate base of B is more stable than conjugate acid of A."},"content":{"rendered":"\n

Conjugate base of B is more stable than conjugate acid of A. A is more acidic than B Consider compound A: resonance form 2 is more stable than 1. Conjugate base of A is more stable than conjugate acid of B. B is more acidic than A. Consider compound A: resonance form 1 is more stable than 2.<\/p>\n\n\n\n

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

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

Correct answer: \u2705 B is more acidic than A.<\/strong><\/p>\n\n\n\n

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

To determine the acidity of compounds A and B, we analyze the stability of their conjugate bases<\/strong>, since a more stable conjugate base corresponds to a stronger acid.<\/p>\n\n\n\n

\n\n\n\n

Structural Overview:<\/h3>\n\n\n\n

Both A<\/strong> and B<\/strong> are nitro-substituted benzoic acid derivatives. Upon deprotonation by a base (PT), they yield conjugate bases that can resonate. The resonance forms (1 and 2) help delocalize the negative charge, contributing to stability.<\/p>\n\n\n\n

\n\n\n\n

Comparing Resonance in A vs. B:<\/h3>\n\n\n\n

Compound A:<\/strong><\/h4>\n\n\n\n
    \n
  • Resonance forms 1 and 2 show delocalization of the negative charge.<\/li>\n\n\n\n
  • In form 2<\/strong>, the lone pair from the negatively charged oxygen interacts with the carbon bearing the nitro group.<\/li>\n\n\n\n
  • However, this interaction places a negative charge on the nitrogen of the nitro group, which is already electron-withdrawing. This is less favorable<\/strong>, making resonance form 2 less stable<\/strong>.<\/li>\n<\/ul>\n\n\n\n

    Compound B:<\/strong><\/h4>\n\n\n\n
      \n
    • In the conjugate base of B, the negative charge is more delocalized<\/strong>, especially in resonance form 2.<\/li>\n\n\n\n
    • The nitro group is in the ortho<\/strong> position to the carboxylate, allowing for better electron delocalization<\/strong> via resonance and inductive effects.<\/li>\n\n\n\n
    • Nitro groups are strong electron-withdrawing<\/strong> groups; they stabilize nearby negative charges through inductive and resonance effects<\/strong>.<\/li>\n<\/ul>\n\n\n\n
      \n\n\n\n

      Conclusion:<\/h3>\n\n\n\n
        \n
      • Compound B\u2019s conjugate base<\/strong> is more stabilized due to stronger resonance and inductive effects<\/strong> from the nitro group.<\/li>\n\n\n\n
      • Therefore, B is more acidic than A<\/strong> because its conjugate base is more stable.<\/li>\n<\/ul>\n\n\n\n
        \n\n\n\n

        Incorrect Statements:<\/h3>\n\n\n\n
          \n
        • \u201cA is more acidic than B\u201d is false.<\/li>\n\n\n\n
        • \u201cConsider compound A: resonance form 2 is more stable than 1\u201d is false (form 1 is more stable).<\/li>\n\n\n\n
        • \u201cConjugate base of A is more stable than conjugate acid of B\u201d is irrelevant and misleading.<\/li>\n<\/ul>\n\n\n\n
          \n\n\n\n

          Final Note:<\/h3>\n\n\n\n

          When analyzing acidity, always prioritize the stability of the conjugate base<\/strong>, which depends on resonance<\/strong>, inductive effects<\/strong>, and electron-withdrawing groups<\/strong>.<\/p>\n\n\n\n

          \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

          Conjugate base of B is more stable than conjugate acid of A. A is more acidic than B Consider compound A: resonance form 2 is more stable than 1. Conjugate base of A is more stable than conjugate acid of B. B is more acidic than A. Consider compound A: resonance form 1 is more […]<\/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-230933","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/230933","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=230933"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/230933\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=230933"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=230933"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=230933"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}