{"id":35040,"date":"2025-06-24T06:23:42","date_gmt":"2025-06-24T06:23:42","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=35040"},"modified":"2025-06-24T06:23:43","modified_gmt":"2025-06-24T06:23:43","slug":"draw-lewis-structures-and-mo-diagrams-for-cn-cn-and-cn","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/draw-lewis-structures-and-mo-diagrams-for-cn-cn-and-cn\/","title":{"rendered":"Draw Lewis structures and MO diagrams for CN+, CN, and CN-"},"content":{"rendered":"\n<p>Draw Lewis structures and MO diagrams for CN+, CN, and CN-. According to the Lewis model, which species is most stable? According to MO theory, which species is most stable? Do the two theories agree?<\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">The correct answer and explanation is:<\/mark><\/strong><\/p>\n\n\n\n<p><strong>Correct Answer:<\/strong><\/p>\n\n\n\n<p>According to the Lewis model, <strong>CN\u207b<\/strong> is the most stable.<br>According to Molecular Orbital (MO) theory, <strong>CN<\/strong> is the most stable.<br><strong>The two theories do not agree.<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Explanation (300 words):<\/strong><\/p>\n\n\n\n<p>To compare CN\u207a, CN, and CN\u207b, we first draw their Lewis structures and analyze their Molecular Orbital (MO) diagrams.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Lewis Structures:<\/strong><\/h3>\n\n\n\n<p>The total valence electrons are calculated by summing the valence electrons of carbon (4) and nitrogen (5), and adjusting for charge:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CN\u207a<\/strong>: 4 + 5 \u2013 1 = 8 electrons<\/li>\n\n\n\n<li><strong>CN<\/strong>: 4 + 5 = 9 electrons<\/li>\n\n\n\n<li><strong>CN\u207b<\/strong>: 4 + 5 + 1 = 10 electrons<\/li>\n<\/ul>\n\n\n\n<p><strong>Lewis Structures:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CN\u207a<\/strong>: C\u2261N\u207a with no lone pairs on carbon, and two lone pairs on nitrogen<\/li>\n\n\n\n<li><strong>CN<\/strong>: C\u2261N with one unpaired electron<\/li>\n\n\n\n<li><strong>CN\u207b<\/strong>: C\u2261N\u207b with a lone pair on carbon and two lone pairs on nitrogen<\/li>\n<\/ul>\n\n\n\n<p>In the Lewis model, structures with complete octets and minimal formal charge are more stable. CN\u207b has a full octet on both atoms and minimized formal charges, making it the most stable by this model.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Molecular Orbital (MO) Diagrams:<\/strong><\/h3>\n\n\n\n<p>The MO diagram for diatomic species with fewer than 14 total electrons follows the 2s\u20132s*\u20132p\u20132p\u03c0\u20132p\u03c3 order.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CN\u207a<\/strong>: 13 electrons \u2192 bond order = (8 bonding \u2013 5 antibonding)\/2 = 1.5<\/li>\n\n\n\n<li><strong>CN<\/strong>: 14 electrons \u2192 bond order = (8 bonding \u2013 4 antibonding)\/2 = 2<\/li>\n\n\n\n<li><strong>CN\u207b<\/strong>: 15 electrons \u2192 bond order = (8 bonding \u2013 5 antibonding)\/2 = 1.5<\/li>\n<\/ul>\n\n\n\n<p>The highest bond order implies the strongest bond and highest stability. According to MO theory, CN is the most stable because it has the highest bond order of 2.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Comparison:<\/strong><\/h3>\n\n\n\n<p>The Lewis theory predicts CN\u207b as most stable due to full octets and charge distribution.<br>The MO theory predicts CN as most stable due to the strongest bond.<\/p>\n\n\n\n<p>Therefore, <strong>the two models do not agree<\/strong> in this case.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Draw Lewis structures and MO diagrams for CN+, CN, and CN-. According to the Lewis model, which species is most stable? According to MO theory, which species is most stable? Do the two theories agree? The correct answer and explanation is: Correct Answer: According to the Lewis model, CN\u207b is the most stable.According to Molecular [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-35040","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/35040","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/comments?post=35040"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/35040\/revisions"}],"predecessor-version":[{"id":35042,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/35040\/revisions\/35042"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=35040"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=35040"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=35040"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}