{"id":190998,"date":"2025-02-14T04:57:07","date_gmt":"2025-02-14T04:57:07","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=190998"},"modified":"2025-02-14T04:57:10","modified_gmt":"2025-02-14T04:57:10","slug":"comparing-ch3br-polar-and-ch4non-polar","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/02\/14\/comparing-ch3br-polar-and-ch4non-polar\/","title":{"rendered":"comparing CH3Br (polar) and CH4(non-polar)"},"content":{"rendered":"\n

comparing CH3<\/sub>Br (polar) and CH4<\/sub>(non-polar)<\/p>\n\n\n\n

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

electronegativity<\/p>\n\n\n\n

C-Br = 0.3 – no dipole moment<\/p>\n\n\n\n

C-H = 0.4 – no dipole moment<\/p>\n\n\n\n

how is CH3Br polar? do you add the dipoles facing thesame direction to get 1.5?<\/p>\n\n\n\n

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

Why is CH\u2083Br Polar While CH\u2084 is Non-Polar?<\/h3>\n\n\n\n

Methyl bromide (CH\u2083Br) is polar<\/strong>, whereas methane (CH\u2084) is non-polar<\/strong> due to differences in molecular shape and dipole moment summation.<\/p>\n\n\n\n

Electronegativity and Dipole Moments<\/strong><\/h4>\n\n\n\n
    \n
  • Electronegativity values (Pauling scale):<\/strong><\/li>\n\n\n\n
  • Carbon (C) = 2.55<\/li>\n\n\n\n
  • Hydrogen (H) = 2.20<\/li>\n\n\n\n
  • Bromine (Br) = 2.96<\/li>\n\n\n\n
  • Bond Dipoles:<\/strong><\/li>\n\n\n\n
  • C-H bond: Difference = 2.55 – 2.20 = 0.35<\/strong> (nearly non-polar)<\/li>\n\n\n\n
  • C-Br bond: Difference = 2.96 – 2.55 = 0.41<\/strong> (small dipole, but important)<\/li>\n<\/ul>\n\n\n\n

    Despite both electronegativity differences being small (0.3\u20130.4), what matters is the molecular geometry<\/strong> and how these dipole moments sum up.<\/p>\n\n\n\n

    Why is CH\u2084 Non-Polar?<\/strong><\/h4>\n\n\n\n
      \n
    • CH\u2084 has a tetrahedral<\/strong> structure with four identical C-H<\/strong> bonds.<\/li>\n\n\n\n
    • The small dipoles in each<\/strong> C-H bond cancel out perfectly<\/strong> due to symmetry.<\/li>\n\n\n\n
    • This results in zero net dipole moment<\/strong>, making CH\u2084 non-polar.<\/li>\n<\/ul>\n\n\n\n

      Why is CH\u2083Br Polar?<\/strong><\/h4>\n\n\n\n
        \n
      • CH\u2083Br is also tetrahedral<\/strong>, but now one hydrogen is replaced by bromine<\/strong>.<\/li>\n\n\n\n
      • The C-Br bond is more polar<\/strong> than the C-H bonds.<\/li>\n\n\n\n
      • The dipole moments<\/strong> do not cancel out due to asymmetry.<\/li>\n\n\n\n
      • The C-Br dipole points towards bromine, while the weaker C-H dipoles point in different directions.<\/li>\n\n\n\n
      • The vector sum<\/strong> of all dipoles gives a net dipole moment<\/strong> towards Br, making CH\u2083Br polar<\/strong>.<\/li>\n<\/ul>\n\n\n\n

        Thus, CH\u2083Br is polar<\/strong> because the dipoles do not completely cancel, unlike CH\u2084 where symmetry ensures no net dipole.<\/p>\n","protected":false},"excerpt":{"rendered":"

        comparing CH3Br (polar) and CH4(non-polar) electronegativity C-Br = 0.3 – no dipole moment C-H = 0.4 – no dipole moment how is CH3Br polar? do you add the dipoles facing thesame direction to get 1.5? The Correct Answer and Explanation is : Why is CH\u2083Br Polar While CH\u2084 is Non-Polar? Methyl bromide (CH\u2083Br) is polar, […]<\/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-190998","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/190998","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=190998"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/190998\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=190998"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=190998"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=190998"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}