{"id":197860,"date":"2025-03-07T18:44:12","date_gmt":"2025-03-07T18:44:12","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=197860"},"modified":"2025-03-07T18:44:14","modified_gmt":"2025-03-07T18:44:14","slug":"which-of-the-following-reagents-cannot-be-used-to-prepare-an-alkyl-chloride-from-an-alcohol","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/07\/which-of-the-following-reagents-cannot-be-used-to-prepare-an-alkyl-chloride-from-an-alcohol\/","title":{"rendered":"Which of the following reagents CANNOT be used to prepare an alkyl chloride from an alcohol"},"content":{"rendered":"\n<p>Which of the following reagents CANNOT be used to prepare an alkyl chloride from an alcohol?<br>Select one:<br>a. HCI, ZnCl2<br>b. SOCI2<br>C. PCl5<br>d. NaCl<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>The correct answer is <strong>d. NaCl<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>An alkyl chloride is typically prepared from an alcohol by replacing the hydroxyl group (-OH) of the alcohol with a chloride ion (-Cl). The reagents listed in the options can either promote substitution or facilitate the formation of an alkyl chloride. Let&#8217;s analyze each reagent in detail.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>a. HCl, ZnCl2<\/strong>:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>HCl (Hydrochloric acid)<\/strong> is a strong acid that can protonate the alcohol, converting the hydroxyl group (-OH) into a better leaving group, -OH2+. The alcohol can then undergo a <strong>SN1<\/strong> (unimolecular nucleophilic substitution) or <strong>SN2<\/strong> (bimolecular nucleophilic substitution) reaction, depending on the structure of the alcohol (tertiary alcohols favor SN1, while primary and secondary alcohols can undergo SN2).<\/li>\n\n\n\n<li><strong>ZnCl2 (Zinc chloride)<\/strong> is a Lewis acid that activates the alcohol, especially in the case of primary alcohols, by coordinating with the oxygen atom, making the leaving group more susceptible to substitution.<\/li>\n\n\n\n<li>The combination of <strong>HCl and ZnCl2<\/strong> is a classic reagent used for preparing alkyl chlorides from alcohols.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>b. SOCl2 (Thionyl chloride)<\/strong>:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Thionyl chloride is a common reagent used for converting alcohols into alkyl chlorides. It reacts with alcohols in a substitution reaction to replace the hydroxyl group with a chloride ion. The reaction proceeds via an <strong>SN2<\/strong> mechanism (due to the strong nucleophilicity of the chloride ion from SOCl2). Thionyl chloride also produces sulfur dioxide (SO2) and hydrogen chloride (HCl) as by-products.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>c. PCl5 (Phosphorus pentachloride)<\/strong>:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Phosphorus pentachloride is a strong chlorinating agent and can convert alcohols into alkyl chlorides. PCl5 reacts with the alcohol by substituting the hydroxyl group with a chlorine atom, also producing phosphorus oxychloride (POCl3) as a by-product. This reaction is highly efficient and is commonly used in laboratory settings.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>d. NaCl (Sodium chloride)<\/strong>:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>NaCl (Sodium chloride)<\/strong> is <strong>not<\/strong> an effective reagent for converting alcohols to alkyl chlorides. Although NaCl is a source of chloride ions, it is not reactive enough on its own to replace the hydroxyl group of the alcohol in a substitution reaction. For substitution to occur, the hydroxyl group must be first activated (e.g., through protonation or the use of a Lewis acid like ZnCl2), but NaCl cannot activate the alcohol or promote the substitution reaction effectively.<\/li>\n<\/ul>\n\n\n\n<p>Therefore, <strong>NaCl<\/strong> cannot be used to prepare alkyl chlorides from alcohols because it does not provide the necessary conditions for the substitution to occur.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Which of the following reagents CANNOT be used to prepare an alkyl chloride from an alcohol?Select one:a. HCI, ZnCl2b. SOCI2C. PCl5d. NaCl The correct answer and explanation is : The correct answer is d. NaCl. Explanation: An alkyl chloride is typically prepared from an alcohol by replacing the hydroxyl group (-OH) of the alcohol with [&hellip;]<\/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-197860","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/197860","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=197860"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/197860\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=197860"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=197860"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=197860"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}