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IR stretching frequencies of carbonyl groups in aldehydes and acid chlorides in cm–1 are:
  • a)
    1730 – 1700 and 1650 – 1580
  • b)
    1680 – 1660 and 1730 – 1700
  • c)
    1730 – 1700 and 1820 – 1770
  • d)
    1680 – 1660 and 1820 – 1770  
Correct answer is option 'C'. Can you explain this answer?
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Here are the IR stretching frequencies of carbonyl groups in aldehydes and acid chlorides:

Aldehydes:
The carbonyl group in aldehydes typically shows an absorption band around 1690-1740 cm^-1. This absorption is due to the C=O stretching vibration.

Acid Chlorides:
The carbonyl group in acid chlorides also shows an absorption band around 1690-1740 cm^-1, similar to aldehydes. However, in acid chlorides, the presence of the chlorine atom can cause a slight shift in the stretching frequency. This shift can result in a slightly lower frequency compared to aldehydes, typically around 1780-1820 cm^-1.

It is important to note that the actual stretching frequencies can vary depending on factors such as the specific compound, substituents, and the surrounding environment. Therefore, these values should be considered as general ranges rather than exact values for all aldehydes and acid chlorides.
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IR stretching frequencies of carbonyl groups in aldehydes and acid chlorides in cm–1 are:a)1730 – 1700 and 1650 – 1580b)1680 – 1660 and 1730 – 1700c)1730 – 1700 and 1820 – 1770d)1680 – 1660 and 1820 – 1770 Correct answer is option 'C'. Can you explain this answer? for Chemistry 2025 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about IR stretching frequencies of carbonyl groups in aldehydes and acid chlorides in cm–1 are:a)1730 – 1700 and 1650 – 1580b)1680 – 1660 and 1730 – 1700c)1730 – 1700 and 1820 – 1770d)1680 – 1660 and 1820 – 1770 Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Chemistry 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for IR stretching frequencies of carbonyl groups in aldehydes and acid chlorides in cm–1 are:a)1730 – 1700 and 1650 – 1580b)1680 – 1660 and 1730 – 1700c)1730 – 1700 and 1820 – 1770d)1680 – 1660 and 1820 – 1770 Correct answer is option 'C'. Can you explain this answer?.
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