[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-1-en-105":3,"doc-seo-572739-105":53,"doc-detail-572739-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,14,19,24,29,34,39,44,49],{"id":8,"doc_module":9,"doc_module_name":10,"category_name":11,"show_sort_weight":12,"slug":13},11,1,"Template","Presentations",90,"presentations",{"id":15,"doc_module":9,"doc_module_name":10,"category_name":16,"show_sort_weight":17,"slug":18},12,"Resumes",80,"resumes",{"id":20,"doc_module":9,"doc_module_name":10,"category_name":21,"show_sort_weight":22,"slug":23},14,"Invoices",70,"invoices",{"id":25,"doc_module":9,"doc_module_name":10,"category_name":26,"show_sort_weight":27,"slug":28},15,"Posters",60,"posters",{"id":30,"doc_module":9,"doc_module_name":10,"category_name":31,"show_sort_weight":32,"slug":33},16,"Social Media",50,"social-media",{"id":35,"doc_module":9,"doc_module_name":10,"category_name":36,"show_sort_weight":37,"slug":38},17,"Forms",40,"forms",{"id":40,"doc_module":9,"doc_module_name":10,"category_name":41,"show_sort_weight":42,"slug":43},18,"Letters",30,"letters",{"id":45,"doc_module":9,"doc_module_name":10,"category_name":46,"show_sort_weight":47,"slug":48},21,"Paper Templates",5,"papers-templates",{"id":50,"doc_module":9,"doc_module_name":10,"category_name":51,"show_sort_weight":4,"slug":52},158,"General","general-158",{"code":4,"msg":54,"data":55},"ok",{"site_id":56,"language":57,"slug":58,"title":59,"keywords":60,"description":61,"schema_data":62,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","ir-spectra-tricks-for-identifying-the-5-zones-its-easier-than-you-think","IR Spectra - Tricks for Identifying the 5 Zones - It’s easier than you think","","IR spectroscopy is a common technique in organic and inorganic chemistry that identifies chemical functional groups by measuring absorption across IR frequencies. The infrared region, especially the five main zones plus a fingerprint area, provides characteristic peak positions and intensities for different bond types. Each zone corresponds to specific stretching frequency ranges, so the observed peak pattern helps determine which functional groups are present in an unknown molecule. The material includes zone tables and practical strategies for remembering groups and assigning spectra.",{"@graph":63,"@context":122},[64,80,101],{"@type":65,"itemListElement":66},"BreadcrumbList",[67,71,74,77],{"item":68,"name":69,"@type":70,"position":9},"https://docshare.wps.com","Home","ListItem",{"item":72,"name":10,"@type":70,"position":73},"https://docshare.wps.com/template/",2,{"item":75,"name":11,"@type":70,"position":76},"https://docshare.wps.com/template/presentations/",3,{"item":78,"name":59,"@type":70,"position":79},"https://docshare.wps.com/template/ir-spectra-tricks-for-identifying-the-5-zones-its-easier-than-you-think/572739/",4,{"url":78,"name":59,"@type":81,"image":82,"author":87,"headline":59,"publisher":90,"fileFormat":93,"inLanguage":57,"description":61,"dateModified":94,"datePublished":95,"encodingFormat":93,"isAccessibleForFree":96,"interactionStatistic":97},"DigitalDocument",{"url":83,"@type":84,"width":85,"height":86},"https://docshare.wps.com/thumbnails/ir-spectra-tricks-for-identifying-the-5-zones-its-easier-than-you-think/572739.png","ImageObject",442,249,{"name":88,"@type":89},"Melati","Person",{"url":68,"name":91,"@type":92},"DocShare","Organization","application/pdf","2026-10-18","2026-10-13",true,{"@type":98,"interactionType":99,"userInteractionCount":9},"InteractionCounter",{"@type":100},"ViewAction",{"@type":102,"mainEntity":103},"FAQPage",[104,110,114,118],{"name":105,"@type":106,"acceptedAnswer":107},"What information does an IR spectrum provide for identification?","Question",{"text":108,"@type":109},"An IR spectrum plots photon energy versus the amount of photons absorbed. By matching peak locations and intensities to zone ranges, it helps identify functional groups present in a molecule.","Answer",{"name":111,"@type":106,"acceptedAnswer":112},"How are the five IR zones used?",{"text":113,"@type":109},"The IR spectrum is divided into five zones, and each zone has characteristic stretching frequency ranges. Specific bonds produce characteristic peak intensities and shapes, so observing the peaks indicates which functional groups are present.",{"name":115,"@type":106,"acceptedAnswer":116},"What are the typical signs of an alcohol O-H stretch in Zone 1?",{"text":117,"@type":109},"Alcohol O-H is listed in Zone 1 with a broad, usually strong peak range around 3650–3200 cm-1. It is often described as broad, with a “tongue-like” appearance.",{"name":119,"@type":106,"acceptedAnswer":120},"How does the practice solution determine the correct molecule?",{"text":121,"@type":109},"The method uses elimination and then checks for key aldehyde indicators. The solution concludes the last molecule, 2-methylpropanal, because the spectrum shows Zone 2 peaks near 2700 and 2900, signifying an aldehyde.","https://schema.org",{"og:url":78,"og:type":124,"og:title":59,"og:site_name":91,"og:description":61},"article",{"robots":126,"canonical":78},"index,follow",{"doc_id":128,"site_id":56},572739,1792338036,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":88,"user_avatar":133,"doc_module":9,"category_id":8,"category_name":11,"doc_title":59,"doc_description":61,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":9,"is_deleted":4,"is_public":9,"is_downloadable":9,"audit_status":9,"page_count":139,"language":140,"language_code":57,"site_id":56,"html_lang":57,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":61,"update_tm":144,"read_time":76},962085570644,"https://ap-avatar.wpscdn.com/davatar_994ba38a5ba835b3df7d355c54d3ed8d","IR Spectra: Tricks for Identifying the 5 Zones  \nIt’s easier than you think! 􀀡  \nIntroduction: The light our eyes see is a small part of a broad spectrum of electromagnetic radiation. On the immediate high energy side of the visible spectrum is the ultraviolet, and on the low energy side is the infrared. The portion of the infrared region is used for analysis of organic compounds.  \nWhy is it useful? Infrared (IR) spectroscopy is one of the most common spectroscopic techniques used by organic and inorganic chemists. Simply, it is the absorption measurement of different IR frequencies by a sample positioned in the path of an IR beam. The main goal ofIR spectroscopic analysis is to determine the chemical functional groups in the sample. Different functional groups absorb characteristic frequencies of IR radiation.  \nBasically: We use the IR Spectrum to identify Functional Groups that are present within a molecule. This is important because knowing the functional groups present brings us closer to identifying an unknown substance and molecule.  \nInfrared Spectrum: is the plot of photon energy (x axis) versus the amount of photons (y axis)  \n• X axis: the stretching frequency • Y axis: the amount of photons absorbed IR Spectrum looks like this:  \nThe IR Spectrum is divided into 5 Zones and a Fingerprint Region. As Chemistry 14C students we do not need to know how to interpret the Fingerprint region.  \nFIVE ZONES  \n• Each zone has a characteristic frequency and in each zone specific bonds have very specific peak intensities. Looking at the peak determines what functional group is present.  \nCharacteristic Stretching Frequencies: The Five Zones (Table)  \n\n| Bond | Stretching Frequency (cm-1) | Intensity and Shape |\n| --- | --- | --- |\n| ZONE 1: 3700-3200 cm-1 |  |  |\n| Alcohol O-H | 3650-3200 cm-1 | Usually strong and broad |\n| Alkyne ≡C-H | 3340-3250 | Usually strong and sharp |\n| Amine or Amide N-H | 3500-3200 | Medium; often broad |\n| ZONE 2: 3200-2700 cm-1 |  |  |\n| Aryl or Vinyl sp^2 C-H | 3100-3000 | Variable |\n| Alkyl sp^3 C-H | 2960-2850 | Variable |\n| Aldehyde | ~2900 and ~2700 | Medium; two peaks |\n| Carboxylic Acid O-H | 3000-25000 | Usually strong; very broad |\n| ZONE 3: 2300-2000 cm-1 |  |  |\n| Alkyne C≡C | 2260-2000 | Variable and sharp |\n| Nitrile C≡N | 2260-2220 | Variable and sharp |\n| ZONE 4: 1850-1650 cm-1 |  |  |\n| Ketone C=O | 1750-1705 | Strong |\n| Ester C=O | 1750-1735 | Strong |\n| Aldehyde C=O | 1740-1720 | Strong |\n| Carboxylic Acid C=O | 1725-1700 | Strong |\n| Amide C=O | 1690-1650 | Strong |\n| ZONE 5: 1680-1450 cm-1 |  |  |\n| Alkene C=C | 1680-1620 | Variable |\n| Benzene Ring C=C | ~1600 and ~1500 | ~1600 often has 2 peaks |\n\nAttention  : The functional group BOLDED are the ones that appear in more than one zone. They must be present in all characteristic zones to exist.  \nFunctional Groups 􀀡 : Here’s a quick recap of some functional groups in case you forgot.  \nKetone Ester Aldehyde Carboxylic Acid Amide Amine  \nTricks for Remembering the FUNCTIONAL GROUPS  \nA Ketone is CoCy (Cocky) KETONE COCEster is a cooc (Cook) ESTER COOC  \nAl Cohs (A man named Al Coughs) Aldehyde COH  \nTricks for Identifying the Zones  \nPractice Problem: Using what you have just learned. Decide which of the following 5 molecules the IR Spectrum below depicts.  \nSolution: You can solve this problem by process of elimination.  \n1. By looking at the IR Spectrum you can eliminate all molecules with an alcohol in it (cyclobutanol and 2-methyl-2-propen-1-ol) . This is because the IR spectrum does not show an alcohol present. (Remember: You need a broad peak at about 3300. Hint: Alcohol peak looks like a tongue.)  \n2. Now you have three choices left. 2-butanone has a ketone present in the molecule.(Remember: A ketone is a Carbon double bonded to an oxygen. The carbon is bonded to two other Carbons). Ethyl Vinyl Ether has an ether present in the molecule (An ether isone functional group that is not identified on within the 5 zones so move on","cbCaiiAXaHZoG3tt","https://ap.wps.com/l/cbCaiiAXaHZoG3tt","pdf",1398347,7,"English","# Introduction\n# Why IR Spectroscopy Is Useful\n# Infrared Spectrum and the 5 Zones\n## Zone 1\n## Zone 2\n## Zone 3\n## Zone 4\n## Zone 5\n# Tricks and Memory Aids\n# Practice Problem and Solution\n# Sources","[{\"question\":\"What information does an IR spectrum provide for identification?\",\"answer\":\"An IR spectrum plots photon energy versus the amount of photons absorbed. By matching peak locations and intensities to zone ranges, it helps identify functional groups present in a molecule.\"},{\"question\":\"How are the five IR zones used?\",\"answer\":\"The IR spectrum is divided into five zones, and each zone has characteristic stretching frequency ranges. Specific bonds produce characteristic peak intensities and shapes, so observing the peaks indicates which functional groups are present.\"},{\"question\":\"What are the typical signs of an alcohol O-H stretch in Zone 1?\",\"answer\":\"Alcohol O-H is listed in Zone 1 with a broad, usually strong peak range around 3650–3200 cm-1. It is often described as broad, with a “tongue-like” appearance.\"},{\"question\":\"How does the practice solution determine the correct molecule?\",\"answer\":\"The method uses elimination and then checks for key aldehyde indicators. The solution concludes the last molecule, 2-methylpropanal, because the spectrum shows Zone 2 peaks near 2700 and 2900, signifying an aldehyde.\"}]","IR Spectra - Tricks for Identifying the 5 Zones - It’s easier than you think | PDF",1791929079]