{"id":6025,"date":"2020-10-13T12:45:50","date_gmt":"2020-10-13T07:15:50","guid":{"rendered":"http:\/\/astan.lk\/al_virtualclassroom\/?p=6025"},"modified":"2020-10-13T12:46:11","modified_gmt":"2020-10-13T07:16:11","slug":"aldehydes-ketons","status":"publish","type":"post","link":"https:\/\/astan.lk\/al_virtualclassroom\/aldehydes-ketons\/","title":{"rendered":"Aldehydes, Ketones"},"content":{"rendered":"<h3>Mechanism of the addition of HCN to aldehydes and ketones.<\/h3>\n<p>This reaction is carried out by adding a dilute mineral acid into a mixture of the carbonyl compound and an aqueous solution of sodium cyanide. Here the CN ion acts as the nucleophile.<\/p>\n<h4><\/h4>\n<h4><b><i>The mechanism for the addition of HCN to propanone<\/i><\/b><\/h4>\n<p>In the first stage, there is a nucleophilic attack by the cyanide ion on the slightly positive carbon atom.<\/p>\n<p align=\"center\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.chemguide.co.uk\/mechanisms\/nucadd\/kethcnm1.GIF\" width=\"293\" height=\"88\" \/><\/p>\n<p>The negative ion formed then picks up a hydrogen ion from somewhere &#8211; for example, from a hydrogen cyanide molecule.<\/p>\n<p align=\"center\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.chemguide.co.uk\/mechanisms\/nucadd\/kethcnm2.GIF\" width=\"385\" height=\"67\" \/><\/p>\n<p>The hydrogen ion could also come from the water or the H<sub>3<\/sub>O<sup>+<\/sup>ions present in the slightly acidic solution<\/p>\n<p>&nbsp;<\/p>\n<h4><b><i>The mechanism for the addition of HCN to ethanal<\/i><\/b><\/h4>\n<p>As before, the reaction starts with a nucleophilic attack by the cyanide ion on the slightly positive carbon atom.<\/p>\n<p align=\"center\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.chemguide.co.uk\/mechanisms\/nucadd\/aldhcnm1.GIF\" width=\"286\" height=\"113\" \/><\/p>\n<p>It is completed by the addition of a hydrogen ion from, for example, a hydrogen cyanide molecule.<\/p>\n<p align=\"center\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.chemguide.co.uk\/mechanisms\/nucadd\/aldhcnm2.GIF\" width=\"367\" height=\"92\" \/><\/p>\n<h3 style=\"text-align: left;\" align=\"center\">Mechanism of the reaction with Grignard reagent (RMgX)<\/h3>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/gr1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-10700\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/gr1-300x66.png\" alt=\"\" width=\"318\" height=\"70\" \/><\/a><\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/gr2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-10699\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/gr2-300x79.png\" alt=\"\" width=\"334\" height=\"88\" \/><\/a><\/p>\n<p>R group of Grignard reagent together with the electron pair of R-Mg bond reacts as a nucleophile with carbonyl carbon.<\/p>\n<p>&nbsp;<\/p>\n<h3>Mechanism of the reaction with Brady\u2019s reagent (2,4-DNP)<\/h3>\n<p><strong>(i) Nucleophilic addition<\/strong><\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/1-19.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-10702\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/1-19-300x111.png\" alt=\"\" width=\"316\" height=\"117\" \/><\/a><\/p>\n<p><strong>(ii) Dehydration<\/strong><br \/>\nThe above intermediate product undergoes dehydration as soon as it is formed to give the final product, which is 2,4\u2013dinitrophenylhydrozone.<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/2-12.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-10701\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/2-12-300x110.png\" alt=\"\" width=\"322\" height=\"118\" \/><\/a><\/p>\n<p>This reaction is used as a test to identify aldyhydes and ketones.<\/p>\n<p>&nbsp;<\/p>\n<h3>Reduction<\/h3>\n<h4>(i) Reduction by LiAlH4 or NaBH4<\/h4>\n<p>Here, the aldehydes and ketones get reduced to alcohols.<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/r1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-10705\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/r1-300x78.png\" alt=\"\" width=\"300\" height=\"78\" \/><\/a><\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/r2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-10704\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/r2-300x70.png\" alt=\"\" width=\"300\" height=\"70\" \/><\/a><\/p>\n<h4><\/h4>\n<h4>(ii) Reduction by Zn(Hg)\/conc. HCl (Clemenson reduction)<\/h4>\n<p>Here, the aldehydes and ketones can be reduced to the corresponding hydrocarbons.<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/r3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-10703\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/r3-300x90.png\" alt=\"\" width=\"300\" height=\"90\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<h3>\u00a0Oxidation of aldehydes<\/h3>\n<p>Aldehydes are oxidized to carboxylic acids even by mild oxidizing agents such as Tollen&#8217;s reagent and Fehling solution.<\/p>\n<h4>(i) Oxidation by Tollen\u2019s reagent<\/h4>\n<p>Tollen\u2019s reagent, [Ag(NH<sub>3<\/sub>)<sub>2<\/sub>]<sup>+<\/sup> is prepared by adding dilute ammonium hydroxide to the precipitate of silver oxide formed by the addition of a few drops of dilute sodium hydroxide to an aqueous solution of silver nitrate.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/www.chemguide.co.uk\/organicprops\/carbonyls\/aldag.gif\" width=\"476\" height=\"19\" \/><\/p>\n<p>Oxidation by Tollen\u2019s reagent or the silver mirror test is used to distinguish between aldehydes and ketones.<\/p>\n<p>&nbsp;<\/p>\n<h4>(ii) Oxidation by Fehling solution<\/h4>\n<p>A solution of basic cupric tartarate is known as Fehling solution. This is a dark blue aquous solution. When a few drops of an aldehyde are added to this reagent and heated, the blue colour of the solution gradually disappears and a brick red precipitate of cuprous oxide is formed.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/www.chemguide.co.uk\/organicprops\/carbonyls\/aldcu.gif\" width=\"457\" height=\"19\" \/><\/p>\n<p>Aldehydes and ketones can be distinguished from each other by Fehling solution.<\/p>\n<p>&nbsp;<\/p>\n<h4>(iii)Oxidation by\u00a0oxidizing agents such as acidified potassium dichromate or acidified chromic oxide or acidified potassium permanganate.<\/h4>\n<p>Aldehydes get oxidised to carboxylic acids by oxidizing agents such as acidified potassium dichromate or acidified chromic oxide or acidified potassium permanganate.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/www.chemguide.co.uk\/organicprops\/carbonyls\/alddichrom.gif\" width=\"416\" height=\"19\" \/><\/p>\n<p>In the presence of aldehydes the pink colour of H<sup>+<\/sup>\/KMnO4 solution become colourless. The orange colour of H<sup>+<\/sup>\/Cr<sub>2<\/sub>O<sub>7<\/sub><sup>2-<\/sup> solution turns green. By using these reagents also aldehydes and ketones can be distinguished from each other.<\/p>\n<p>&nbsp;<\/p>\n<h3>The reactivity of the alpha position of aldehydes and ketones as exemplified by selfcondensation reactions.<\/h3>\n<p>\u2022 Due to the strong electron withdrawing nature of the carbonyl group, H atoms attached to the carbon atoms directly bound to the carbonyl carbon (the \u03b1- H) become acidic. The \u03b1- H can be abstracted as a proton by base (eg. OH<sup>&#8211;<\/sup>).The carbanion so formed is stabilized by resonance as shown below<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/c1-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-10709\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/c1-1-300x132.png\" alt=\"\" width=\"300\" height=\"132\" \/><\/a><\/p>\n<p>The above carbanion attacks the carbon atom of the carbonyl group of an unionized aldehyde molecule as a nucleophile. Hence aldehydes and ketones with \u03b1\u00a0hydrogens undergo self &#8211; condensation reactions.<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.mhhe.com\/physsci\/chemistry\/carey5e\/Ch18\/aldol-01.gif\" alt=\"Aldol condensation of an aldehdye\" \/><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.mhhe.com\/physsci\/chemistry\/carey5e\/Ch18\/aldol-03.gif\" alt=\"Aldol condensation of a ketone\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Examples<\/p>\n<p>Reaction of acetaldehyde in the presence of aqueous NaOH<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/q2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-10712\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/q2-300x76.png\" alt=\"\" width=\"300\" height=\"76\" \/><\/a><\/p>\n<p>Condensation of acetone<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/q3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-10711\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/q3-300x60.png\" alt=\"\" width=\"300\" height=\"60\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>The addition products obtained above undergo dehydration easily.<br \/>\nExamples :<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/q4.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-10710\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/q4-300x88.png\" alt=\"\" width=\"324\" height=\"95\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mechanism of the addition of HCN to aldehydes and ketones. This reaction is carried out by adding a dilute mineral acid into a mixture of the carbonyl compound and an aqueous solution of sodium cyanide. Here the CN ion acts as the nucleophile. The mechanism for the addition of HCN to propanone In the first [&hellip;]<\/p>\n","protected":false},"author":842,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[14,1670],"tags":[],"class_list":["post-6025","post","type-post","status-publish","format-standard","hentry","category-chemistry","category-unit-10"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aldehydes, Ketones - Learning &amp; Education Portal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/astan.lk\/al_virtualclassroom\/aldehydes-ketons\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aldehydes, Ketones - Learning &amp; Education Portal\" \/>\n<meta property=\"og:description\" content=\"Mechanism of the addition of HCN to aldehydes and ketones. 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