{"id":4473,"date":"2025-06-04T15:00:10","date_gmt":"2025-06-04T15:00:10","guid":{"rendered":"https:\/\/diznr.com\/?p=4473"},"modified":"2025-06-04T15:00:10","modified_gmt":"2025-06-04T15:00:10","slug":"nomenclature-rules-of-numbering-of-carbon-chain-in-easy-ways-part-04","status":"publish","type":"post","link":"https:\/\/www.reilsolar.com\/pdf\/nomenclature-rules-of-numbering-of-carbon-chain-in-easy-ways-part-04\/","title":{"rendered":"Nomenclature &#8211; Rules of numbering of carbon chain in easy ways Part &#8211; 04"},"content":{"rendered":"<p>Nomenclature &#8211; Rules of numbering of carbon chain in easy ways Part &#8211; 04<\/p>\n<p>[fvplayer id=&#8221;787&#8243;]<\/p>\n<p>\u092f\u0939\u093e\u0901 <strong>Nomenclature (\u0928\u093e\u092e\u0915\u0930\u0923)<\/strong> \u092e\u0947\u0902 <strong>Carbon Chain \u0915\u0940 Numbering \u0915\u0947 \u0906\u0938\u093e\u0928 \u0928\u093f\u092f\u092e<\/strong> \u0915\u094b <strong>Part-04<\/strong> \u0915\u0947 \u0930\u0942\u092a \u092e\u0947\u0902 \u0938\u0930\u0932 \u092d\u093e\u0937\u093e \u092e\u0947\u0902 \u0938\u092e\u091d\u093e\u092f\u093e \u0917\u092f\u093e \u0939\u0948, \u0916\u093e\u0938\u0915\u0930 \u091b\u093e\u0924\u094d\u0930\u094b\u0902 \u0915\u0947 \u0932\u093f\u090f \u091c\u094b NEET, JEE \u092f\u093e \u092c\u094b\u0930\u094d\u0921 \u092a\u0930\u0940\u0915\u094d\u0937\u093e\u0913\u0902 \u0915\u0940 \u0924\u0948\u092f\u093e\u0930\u0940 \u0915\u0930 \u0930\u0939\u0947 \u0939\u0948\u0902\u0964<\/p>\n<hr \/>\n<h2>\ud83d\udcda <strong>Part 04 \u2013 Easy Rules for Numbering of Carbon Chain (IUPAC Nomenclature)<\/strong><\/h2>\n<h3>\ud83d\udd22 <strong>Rule 1: Longest Carbon Chain \u091a\u0941\u0928\u094b<\/strong><\/h3>\n<ul>\n<li>\u0938\u092c\u0938\u0947 \u092a\u0939\u0932\u0947 <strong>\u0932\u0902\u092c\u0940 \u0914\u0930 \u0932\u0917\u093e\u0924\u093e\u0930 (continuous)<\/strong> carbon chain \u0915\u094b \u092a\u0939\u091a\u093e\u0928\u094b\u0964<\/li>\n<li>\u092f\u0939 chain \u0935\u0939\u0940 \u0939\u094b\u0917\u0940 \u091c\u093f\u0938\u092e\u0947\u0902 \u091c\u093c\u094d\u092f\u093e\u0926\u093e functional groups, double\/triple bonds, \u092f\u093e substituents \u0939\u094b\u0902\u0964<\/li>\n<\/ul>\n<p>\ud83d\udccc <em>Trick:<\/em> \u0905\u0917\u0930 \u090f\u0915 \u0938\u0947 \u091c\u093c\u094d\u092f\u093e\u0926\u093e chain same length \u0915\u0940 \u0939\u094b\u0902, \u0924\u094b \u0909\u0938 chain \u0915\u094b \u091a\u0941\u0928\u094b \u091c\u093f\u0938\u092e\u0947\u0902 \u091c\u093c\u094d\u092f\u093e\u0926\u093e functional group \u092f\u093e double\/triple bond \u0936\u093e\u092e\u093f\u0932 \u0939\u094b\u0964<\/p>\n<hr \/>\n<h3>\ud83d\udd22 <strong>Rule 2: Lowest Locant Rule (\u0938\u092c\u0938\u0947 \u091b\u094b\u091f\u0940 \u0938\u0902\u0916\u094d\u092f\u093e \u0926\u094b)<\/strong><\/h3>\n<ul>\n<li>Chain \u0915\u094b \u0907\u0938 \u0924\u0930\u0939 number \u0915\u0930\u094b \u0915\u093f:\n<ul>\n<li>functional group \u0915\u094b <strong>lowest number<\/strong> \u092e\u093f\u0932\u0947\u0964<\/li>\n<li>\u0905\u0917\u0930 functional group \u0928 \u0939\u094b, \u0924\u094b <strong>double\/triple bond<\/strong> \u0915\u094b lowest number \u0926\u094b\u0964<\/li>\n<li>\u0905\u0917\u0930 \u0935\u0939 \u092d\u0940 \u0928 \u0939\u094b, \u0924\u094b <strong>substituents (alkyl group)<\/strong> \u0915\u094b lowest number \u0926\u094b\u0964<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\ud83d\udccc <em>Trick:<\/em><br \/>\nFunctional Group &gt; Double\/Triple Bond &gt; Substituents<\/p>\n<hr \/>\n<h3>\ud83d\udd22 <strong>Rule 3: Multiple Substituents \u0939\u094b \u0924\u094b Alphabetical Order \u092e\u0947\u0902 \u0928\u093e\u092e \u0926\u094b<\/strong><\/h3>\n<ul>\n<li>\u0928\u093e\u092e \u0932\u093f\u0916\u0924\u0947 \u0938\u092e\u092f \u0938\u092d\u0940 side groups (\u091c\u0948\u0938\u0947: methyl, ethyl) \u0915\u094b <strong>alphabetically<\/strong> arrange \u0915\u0930\u094b\u0964<\/li>\n<li>\u0932\u0947\u0915\u093f\u0928 numbering \u0935\u0939\u0940 \u0930\u0916\u094b \u091c\u093f\u0938\u0938\u0947 total locants \u0915\u093e sum <strong>\u0915\u092e \u0938\u0947 \u0915\u092e<\/strong> \u0939\u094b\u0964<\/li>\n<\/ul>\n<p>\ud83d\udccc <em>Note:<\/em> Alphabetical order \u0938\u093f\u0930\u094d\u092b \u0928\u093e\u092e \u0932\u093f\u0916\u0928\u0947 \u092e\u0947\u0902 \u0915\u093e\u092e \u0906\u0924\u093e \u0939\u0948, numbering \u092e\u0947\u0902 \u0928\u0939\u0940\u0902\u0964<\/p>\n<hr \/>\n<h3>\ud83e\uddea <strong>Rule 4: Functional Group Priority Order<\/strong> (IUPAC \u0915\u0947 \u0905\u0928\u0941\u0938\u093e\u0930)<\/h3>\n<p>\u0905\u0917\u0930 \u090f\u0915 \u0938\u0947 \u0905\u0927\u093f\u0915 functional groups \u0939\u094b\u0902, \u0924\u094b \u092f\u0939 \u092a\u094d\u0930\u093e\u0925\u092e\u093f\u0915\u0924\u093e \u0915\u094d\u0930\u092e \u092f\u093e\u0926 \u0930\u0916\u094b:<\/p>\n<pre><code>\u2013COOH (carboxylic acid) &gt; \u2013SO3H &gt; \u2013COOR &gt; \u2013COX &gt; \u2013CONH2 &gt; \u2013CHO &gt; \u2013C=O &gt; \u2013OH &gt; \u2013NH2 &gt; \u2013C\u2261C &gt; \u2013C=C\n<\/code><\/pre>\n<p>\ud83d\udccc <em>Trick:<\/em> &#8220;Carboxylic acid always wins!&#8221; \u092f\u093e\u0928\u0940 \u0909\u0938\u0915\u094b \u0939\u092e\u0947\u0936\u093e \u0938\u092c\u0938\u0947 \u091b\u094b\u091f\u093e \u0928\u0902\u092c\u0930 \u092e\u093f\u0932\u0947\u0917\u093e\u0964<\/p>\n<hr \/>\n<h3>\ud83e\uddea <strong>Rule 5: Unsaturation Preference<\/strong><\/h3>\n<ul>\n<li>Double \u0914\u0930 Triple bond \u0926\u094b\u0928\u094b\u0902 \u0939\u094b\u0928\u0947 \u092a\u0930 numbering \u0907\u0938 \u0924\u0930\u0939 \u0915\u0930\u094b \u0915\u093f <strong>double bond \u0915\u094b \u092a\u094d\u0930\u093e\u0925\u092e\u093f\u0915\u0924\u093e \u092e\u093f\u0932\u0947\u0964<\/strong><\/li>\n<\/ul>\n<p>\ud83d\udccc <em>Example:<\/em><br \/>\nCH\u2082=CH\u2013C\u2261CH<br \/>\nNumbering: 1=2=3\u22614<br \/>\nName: <strong>But-1-en-3-yne<\/strong><\/p>\n<hr \/>\n<h3>\ud83d\udd0d <strong>Examples for Practice<\/strong><\/h3>\n<p><strong>Example 1:<\/strong><br \/>\nCH\u2083\u2013CH\u2082\u2013CH(CH\u2083)\u2013CH\u2082\u2013CH\u2083<\/p>\n<ul>\n<li>Longest chain = 5 carbon<\/li>\n<li>Methyl group at position 3<br \/>\n<strong>IUPAC Name:<\/strong> 3-Methylpentane<\/li>\n<\/ul>\n<p><strong>Example 2:<\/strong><br \/>\nCH\u2083\u2013CH=CH\u2013CH\u2082\u2013COOH<\/p>\n<ul>\n<li>Functional group: \u2013COOH<\/li>\n<li>Double bond: CH=CH<\/li>\n<li>Number from COOH side<br \/>\n<strong>IUPAC Name:<\/strong> <strong>Pent-2-enoic acid<\/strong><\/li>\n<\/ul>\n<hr \/>\n<h2>\ud83e\udde0 <strong>Quick Summary Chart<\/strong><\/h2>\n<table>\n<thead>\n<tr>\n<th>Feature<\/th>\n<th>Priority in Numbering<\/th>\n<th>Notes<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Functional Group<\/td>\n<td>Highest<\/td>\n<td>COOH, CHO always get lowest number<\/td>\n<\/tr>\n<tr>\n<td>Multiple Bonds (=, \u2261)<\/td>\n<td>After FG<\/td>\n<td>= preferred over \u2261<\/td>\n<\/tr>\n<tr>\n<td>Alkyl Substituents<\/td>\n<td>Last<\/td>\n<td>Name in alphabetical order<\/td>\n<\/tr>\n<tr>\n<td>Numbering Direction<\/td>\n<td>Left to right \/ vice versa<\/td>\n<td>That gives lowest locant<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h2>\ud83d\udcd8 Want More?<\/h2>\n<ul>\n<li>\u2705 Practice Worksheet (PDF) on Nomenclature<\/li>\n<li>\u2705 MCQ Based on Carbon Numbering<\/li>\n<li>\u2705 Hindi Medium Notes<\/li>\n<li>\u2705 Trick Sheet: Prefixes, Suffixes, Roots (Meth, Eth, Prop\u2026)<\/li>\n<\/ul>\n<hr \/>\n<p>\u0905\u0917\u0930 \u0906\u092a <strong>Part-05<\/strong> \u092f\u093e <strong>Worksheet + Solution in PDF<\/strong> \u091a\u093e\u0939\u0924\u0947 \u0939\u0948\u0902, \u0924\u094b \u092c\u0924\u093e\u0907\u090f \u2014 \u092e\u0948\u0902 \u0924\u0941\u0930\u0902\u0924 \u092c\u0928\u093e \u0938\u0915\u0924\u093e \u0939\u0942\u0901\u0964<\/p>\n<h3><a href=\"https:\/\/unacademy.com\/content\/wp-content\/uploads\/sites\/2\/2022\/10\/Nomenclature-of-Organic-Compounds-Notes.pdf\" target=\"_blank\" rel=\"noopener\">Nomenclature &#8211; Rules of numbering of carbon chain in easy ways Part &#8211; 04<\/a><\/h3>\n<h3 class=\"LC20lb MBeuO DKV0Md\"><a href=\"https:\/\/iupac.org\/wp-content\/uploads\/2021\/06\/Organic-Brief-Guide-brochure_v1.1_June2021.pdf\" target=\"_blank\" rel=\"noopener\">Brief Guide to the Nomenclature of Organic Chemistry<\/a><\/h3>\n<h3 class=\"LC20lb MBeuO DKV0Md\"><a href=\"https:\/\/www.cuyamaca.edu\/student-support\/tutoring-center\/files\/student-resources\/IUPAC_Handout.pdf\" target=\"_blank\" rel=\"noopener\">Short Summary of IUPAC Nomenclature of Organic &#8230;<\/a><\/h3>\n<h3 class=\"LC20lb MBeuO DKV0Md\"><a href=\"https:\/\/publications.iupac.org\/pac\/pdf\/1965\/pdf\/1101x0001.pdf\" target=\"_blank\" rel=\"noopener\">nomenclature of organic chemistry<\/a><\/h3>\n","protected":false},"excerpt":{"rendered":"<p>Nomenclature &#8211; Rules of numbering of carbon chain in easy ways Part &#8211; 04 [fvplayer id=&#8221;787&#8243;] \u092f\u0939\u093e\u0901 Nomenclature (\u0928\u093e\u092e\u0915\u0930\u0923) \u092e\u0947\u0902 Carbon Chain \u0915\u0940 Numbering \u0915\u0947 \u0906\u0938\u093e\u0928 \u0928\u093f\u092f\u092e \u0915\u094b Part-04 \u0915\u0947 \u0930\u0942\u092a \u092e\u0947\u0902 \u0938\u0930\u0932 \u092d\u093e\u0937\u093e \u092e\u0947\u0902 \u0938\u092e\u091d\u093e\u092f\u093e \u0917\u092f\u093e \u0939\u0948, \u0916\u093e\u0938\u0915\u0930 \u091b\u093e\u0924\u094d\u0930\u094b\u0902 \u0915\u0947 \u0932\u093f\u090f \u091c\u094b NEET, JEE \u092f\u093e \u092c\u094b\u0930\u094d\u0921 \u092a\u0930\u0940\u0915\u094d\u0937\u093e\u0913\u0902 \u0915\u0940 \u0924\u0948\u092f\u093e\u0930\u0940 \u0915\u0930 \u0930\u0939\u0947 \u0939\u0948\u0902\u0964 \ud83d\udcda Part [&hellip;]<\/p>\n","protected":false},"author":64,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,18],"tags":[],"class_list":["post-4473","post","type-post","status-publish","format-standard","hentry","category-class-11-and-12-physical-chemistry","category-iit-neet-chemistry"],"_links":{"self":[{"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/posts\/4473","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/users\/64"}],"replies":[{"embeddable":true,"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/comments?post=4473"}],"version-history":[{"count":0,"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/posts\/4473\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/media?parent=4473"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/categories?post=4473"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.reilsolar.com\/pdf\/wp-json\/wp\/v2\/tags?post=4473"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}