{"id":184018,"date":"2025-01-18T02:31:04","date_gmt":"2025-01-18T02:31:04","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=184018"},"modified":"2025-01-18T02:31:06","modified_gmt":"2025-01-18T02:31:06","slug":"rank-the-given-compounds-based-on-their-relative-acidities","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/01\/18\/rank-the-given-compounds-based-on-their-relative-acidities\/","title":{"rendered":"Rank the given compounds based on their relative acidities"},"content":{"rendered":"\n

Rank the given compounds based on their relative acidities. strongest acid HF HC=CH H,C=CH, NH, H,CCH, weakest acid None<\/p>\n\n\n\n

The correct answer and explanation is:<\/mark><\/strong><\/p>\n\n\n\n

Correct Ranking (from strongest to weakest acid):<\/h3>\n\n\n\n
    \n
  1. HF<\/strong><\/li>\n\n\n\n
  2. HC\u2261CH (ethyne)<\/strong><\/li>\n\n\n\n
  3. H2C=CH2 (ethene)<\/strong><\/li>\n\n\n\n
  4. NH3 (ammonia)<\/strong><\/li>\n\n\n\n
  5. H3CCH3 (ethane)<\/strong><\/li>\n<\/ol>\n\n\n\n

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

    Acidity is determined by the compound\u2019s ability to donate a proton (H\u207a). This is influenced by the stability of the conjugate base formed after losing the proton. Here\u2019s the rationale for the ranking:<\/p>\n\n\n\n

      \n
    1. HF (hydrofluoric acid)<\/strong>: HF is the strongest acid in this group. After losing a proton, it forms the fluoride ion (F\u207b), which is highly stable due to fluorine\u2019s high electronegativity. This stability greatly favors proton donation, making HF the most acidic compound.<\/li>\n\n\n\n
    2. HC\u2261CH (ethyne)<\/strong>: Ethyne is acidic due to the sp-hybridized carbon atom bonded to the hydrogen. Sp-hybridized carbons have a high percentage of s-character (50%), which makes the carbon atom more electronegative and stabilizes the negative charge on the conjugate base (acetylide ion, HC\u2261C\u207b). This contributes to its relatively high acidity compared to other hydrocarbons.<\/li>\n\n\n\n
    3. H2C=CH2 (ethene)<\/strong>: Ethene is less acidic than ethyne because its sp\u00b2-hybridized carbon atoms have less s-character (33%) than sp-hybridized carbons. This makes the conjugate base (CH2=CH\u207b) less stable, resulting in lower acidity.<\/li>\n\n\n\n
    4. NH3 (ammonia)<\/strong>: Ammonia is a weak acid because its conjugate base (NH2\u207b) is not as stabilized as the conjugate bases of HF or hydrocarbons with sp-hybridized carbons. Nitrogen is less electronegative than fluorine and does not stabilize the negative charge as effectively.<\/li>\n\n\n\n
    5. H3CCH3 (ethane)<\/strong>: Ethane is the weakest acid because its sp\u00b3-hybridized carbons have the least s-character (25%), and the conjugate base (ethyl anion, H3CCH2\u207b) is highly unstable. Hydrocarbons with sp\u00b3 carbons are generally non-acidic.<\/li>\n<\/ol>\n\n\n\n

      This ranking reflects the interplay between hybridization, electronegativity, and conjugate base stability, which collectively govern acidity.<\/p>\n","protected":false},"excerpt":{"rendered":"

      Rank the given compounds based on their relative acidities. strongest acid HF HC=CH H,C=CH, NH, H,CCH, weakest acid None The correct answer and explanation is: Correct Ranking (from strongest to weakest acid): Explanation: Acidity is determined by the compound\u2019s ability to donate a proton (H\u207a). This is influenced by the stability of the conjugate base […]<\/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-184018","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/184018","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=184018"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/184018\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=184018"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=184018"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=184018"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}