{"id":31482,"date":"2025-06-22T02:55:20","date_gmt":"2025-06-22T02:55:20","guid":{"rendered":"https:\/\/gaviki.com\/blog\/?p=31482"},"modified":"2025-06-22T02:55:23","modified_gmt":"2025-06-22T02:55:23","slug":"which-of-the-following-compounds-would-you-expect-the-give-the-ir-spectrum-shown-below","status":"publish","type":"post","link":"https:\/\/gaviki.com\/blog\/which-of-the-following-compounds-would-you-expect-the-give-the-ir-spectrum-shown-below\/","title":{"rendered":"Which of the following compounds would you expect the give the IR spectrum shown below"},"content":{"rendered":"\n

Which of the following compounds would you expect the give the IR spectrum shown below? (One correct answer.) a) \\text{Image of a molecule} b) \\text{Image of a molecule} c) \\text{Image of a molecule} d) \\text{Image of a molecule} \\text{Image of an IR spectrum}<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n

The compound that corresponds to the given IR spectrum is compound c<\/strong>.<\/p>\n\n\n\n

To justify this choice, let\u2019s analyze the key absorption features:<\/p>\n\n\n\n

    \n
  1. Sharp, strong peak near 1700 cm\u207b\u00b9<\/strong> This is characteristic of a carbonyl (C=O) stretching vibration, which appears in the range 1680\u20131750 cm\u207b\u00b9. All compounds except b and d contain a carbonyl group, immediately eliminating them from consideration.<\/li>\n\n\n\n
  2. Absence of a broad O\u2013H stretch near 3200\u20133600 cm\u207b\u00b9<\/strong> A broad peak in this region would suggest an alcohol or phenol group. Compounds b and d contain hydroxyl groups, but the spectrum shows no such broad absorption. Therefore, these two can be ruled out.<\/li>\n\n\n\n
  3. No aromatic overtones near 1600\u20132000 cm\u207b\u00b9 and no characteristic peaks near 1500\u20131600 cm\u207b\u00b9<\/strong> Aromatic rings tend to give multiple moderate peaks in this region. Compound a has a benzene ring, which should generate those signals. Since the spectrum lacks these, compound a does not match.<\/li>\n<\/ol>\n\n\n\n

    Now we are left with compound c. It features a carbonyl group (likely a ketone) and two ethyl chains. The IR spectrum supports this because:<\/p>\n\n\n\n

      \n
    • The strong C=O stretch near 1700 cm\u207b\u00b9 confirms the presence of a ketone<\/li>\n\n\n\n
    • The absence of broad O\u2013H stretches rules out alcohols or carboxylic acids<\/li>\n\n\n\n
    • The fingerprint region (below 1500 cm\u207b\u00b9) displays patterns that are typical of saturated hydrocarbons, consistent with ethyl groups<\/li>\n<\/ul>\n\n\n\n

      In conclusion, compound c matches the IR spectrum due to the presence of a ketone group and aliphatic chains, without any hydroxyl or aromatic features. The IR evidence supports this structure better than any of the others presented.<\/p>\n\n\n\n

      \"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

      Which of the following compounds would you expect the give the IR spectrum shown below? (One correct answer.) a) \\text{Image of a molecule} b) \\text{Image of a molecule} c) \\text{Image of a molecule} d) \\text{Image of a molecule} \\text{Image of an IR spectrum} The Correct Answer and Explanation is: The compound that corresponds to the […]<\/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-31482","post","type-post","status-publish","format-standard","hentry","category-quiz-questions"],"_links":{"self":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/31482","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=31482"}],"version-history":[{"count":1,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/31482\/revisions"}],"predecessor-version":[{"id":31485,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/posts\/31482\/revisions\/31485"}],"wp:attachment":[{"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/media?parent=31482"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/categories?post=31482"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gaviki.com\/blog\/wp-json\/wp\/v2\/tags?post=31482"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}