{"id":19905,"date":"2024-04-15T05:45:48","date_gmt":"2024-04-15T05:45:48","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=19905"},"modified":"2024-04-15T05:45:48","modified_gmt":"2024-04-15T05:45:48","slug":"for-the-aldotetroses-i-iv-the-combination-of-true-statements-among-p-t-is-p-i-and-ii-are-diastereomers-and-ii-and-iii-are-enantiomers-q-i-and-iv-are-mesomers-and-are-optically-inactive-r-i-an","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/for-the-aldotetroses-i-iv-the-combination-of-true-statements-among-p-t-is-p-i-and-ii-are-diastereomers-and-ii-and-iii-are-enantiomers-q-i-and-iv-are-mesomers-and-are-optically-inactive-r-i-an\/","title":{"rendered":"For the aldotetroses I-IV, the combination of true statements, among P-T, is P = I and II are diastereomers and II and III are enantiomers Q = I and IV are mesomers and are optically inactive R = I and III can be interconverted by a base catalysed isomerisation S = only I and IV are HlO4 cleavable T = I and III are D-sugars and II and IV are L-sugars A. Q, R, T B. P, R, T C. Q, R, S, T D. P, Q, S"},"content":{"rendered":"<p>[amp_mcq option1=&#8221;Q, R, T&#8221; option2=&#8221;P, R, T&#8221; option3=&#8221;Q, R, S, T&#8221; option4=&#8221;P, Q, S&#8221; correct=&#8221;option4&#8243;]<!--more--><\/p>\n<p>The correct answer is D. P, Q, S.<\/p>\n<p>P: I and II are diastereomers. This is true because they have the same molecular formula but different configurations at one or more stereogenic centers.<\/p>\n<p>Q: I and IV are mesomers and are optically inactive. This is true because they have two identical chiral centers and the two enantiomers cancel each other out.<\/p>\n<p>S: only I and IV are HlO4 cleavable. This is true because they have an acetal group that can be cleaved by HlO4.<\/p>\n<p>R: I and III can be interconverted by a base catalysed isomerisation. This is false because I and III are mesomers and cannot be interconverted by a base catalysed isomerisation.<\/p>\n<p>T: I and III are D-sugars and II and IV are L-sugars. This is false because I and IV are mesomers and do not have a specific D or L configuration.<\/p>\n<p>Here is a diagram of the aldotetroses I-IV:<\/p>\n<p>The chiral centers are marked with asterisks.<\/p>\n<p>I and II are diastereomers because they have different configurations at the C2 chiral center.<\/p>\n<p>I and IV are mesomers because they have two identical chiral centers and the two enantiomers cancel each other out.<\/p>\n<p>I and IV have an acetal group that can be cleaved by HlO4.<\/p>\n<p>I and III cannot be interconverted by a base catalysed isomerisation because they are mesomers.<\/p>\n<p>I and IV are not D or L sugars because they are mesomers.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[amp_mcq option1=&#8221;Q, R, T&#8221; option2=&#8221;P, R, T&#8221; option3=&#8221;Q, R, S, T&#8221; option4=&#8221;P, Q, S&#8221; correct=&#8221;option4&#8243;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-19905","post","type-post","status-publish","format-standard","hentry","category-basics-of-organic-reaction-mechanism","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>For the aldotetroses I-IV, the combination of true statements, among P-T, is P = I and II are diastereomers and II and III are enantiomers Q = I and IV are mesomers and are optically inactive R = I and III can be interconverted by a base catalysed isomerisation S = only I and IV are HlO4 cleavable T = I and III are D-sugars and II and IV are L-sugars A. Q, R, T B. P, R, T C. Q, R, S, T D. P, Q, S<\/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:\/\/exam.pscnotes.com\/mcq\/for-the-aldotetroses-i-iv-the-combination-of-true-statements-among-p-t-is-p-i-and-ii-are-diastereomers-and-ii-and-iii-are-enantiomers-q-i-and-iv-are-mesomers-and-are-optically-inactive-r-i-an\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"For the aldotetroses I-IV, the combination of true statements, among P-T, is P = I and II are diastereomers and II and III are enantiomers Q = I and IV are mesomers and are optically inactive R = I and III can be interconverted by a base catalysed isomerisation S = only I and IV are HlO4 cleavable T = I and III are D-sugars and II and IV are L-sugars A. Q, R, T B. P, R, T C. Q, R, S, T D. 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