{"id":6121,"date":"2018-09-08T17:39:27","date_gmt":"2018-09-09T00:39:27","guid":{"rendered":"http:\/\/blogs.reed.edu\/chem201202\/?p=6121"},"modified":"2018-09-08T17:39:27","modified_gmt":"2018-09-09T00:39:27","slug":"where-do-i-put-my-ch3-groups-in-a-condensed-formula","status":"publish","type":"post","link":"https:\/\/blogs.reed.edu\/chem201202\/2018\/09\/where-do-i-put-my-ch3-groups-in-a-condensed-formula\/","title":{"rendered":"Where do I put my CH3 groups in a condensed formula?"},"content":{"rendered":"<p>I&#8217;ve been getting a <em>lot<\/em> of office visits and emails over the same homework problem. Folks say, &#8220;I typed CH3CH2CH(CH3)CH(CH3)CH3&#8221; or &#8220;I typed CH3(CH3)CHCH&#8230;&#8221; or &#8220;I typed CH3CH(CH3)CH&#8230;&#8221; and it was marked incorrect. =(<\/p>\n<p><!--more--><\/p>\n<p>Unfortunately, it is incorrect. The CH is attached to two identical CH3 groups so they need to be collected together in the condensed formula. (CH3)2CHCH&#8230; or &#8230;CHCH(CH3)2 are both acceptable.<\/p>\n<p>From the conversations I&#8217;ve had I think the problem is conflating IUPAC (systematic) naming rules with condensed formula drawing rules. The former requires a distinction between parent chain atoms &#8230;CHCH3 and substituents -CH3, but the condensed formula does not.<\/p>\n<p>Thanks for your questions.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I&#8217;ve been getting a lot of office visits and emails over the same homework problem. Folks say, &#8220;I typed CH3CH2CH(CH3)CH(CH3)CH3&#8221; or &#8220;I typed CH3(CH3)CHCH&#8230;&#8221; or &#8220;I typed CH3CH(CH3)CH&#8230;&#8221; and it was marked incorrect. =(<\/p>\n","protected":false},"author":55,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-6121","post","type-post","status-publish","format-standard","hentry","category-homework"],"_links":{"self":[{"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/posts\/6121","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/users\/55"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/comments?post=6121"}],"version-history":[{"count":1,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/posts\/6121\/revisions"}],"predecessor-version":[{"id":6122,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/posts\/6121\/revisions\/6122"}],"wp:attachment":[{"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/media?parent=6121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/categories?post=6121"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.reed.edu\/chem201202\/wp-json\/wp\/v2\/tags?post=6121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}