IIT JAM Exam > IIT JAM Videos > Part 8: UV Visible Spectroscopy-Woodward Fieser Rule for α, ꞵ Unsaturated Carbonyl Compounds
Part 8: UV Visible Spectroscopy-Woodward Fieser Rule for α, ꞵ Unsaturated Carbonyl Compounds Video Lecture - IIT JAM
FAQs on Part 8: UV Visible Spectroscopy-Woodward Fieser Rule for α, ꞵ Unsaturated Carbonyl Compounds Video Lecture - IIT JAM
| 1. What is UV-visible spectroscopy? |  |
| 2. What is the Woodward-Fieser rule? | |
Ans. The Woodward-Fieser rule is a set of empirical rules used to estimate the maximum absorption wavelength (λmax) of α, β-unsaturated carbonyl compounds. It takes into account the type and position of substituents on the conjugated system and provides a quantitative measure for predicting the absorption characteristics of these compounds.
| 3. How does the Woodward-Fieser rule help in determining λmax? | |
Ans. The Woodward-Fieser rule assigns specific values (E or S) to different substituents based on their effect on the conjugated system. These values are then summed up according to the position of the substituents to obtain a total value (ΣE or ΣS). By using these values, one can estimate the λmax of the compound using specific equations or charts provided by the rule.
| 4. Can the Woodward-Fieser rule be applied to all α, β-unsaturated carbonyl compounds? | |
Ans. The Woodward-Fieser rule is most applicable to compounds with conjugated systems containing only carbon-carbon double bonds and carbonyl groups. It may not accurately predict the absorption characteristics of compounds with additional functional groups or complex structures. In such cases, experimental measurements are often necessary for accurate determination of λmax.
| 5. How is the Woodward-Fieser rule relevant to the IIT JAM exam? | |
Ans. The Woodward-Fieser rule is a topic commonly included in the syllabus of organic chemistry for the IIT JAM exam. Understanding this rule is important for students to predict and interpret the UV-visible spectra of α, β-unsaturated carbonyl compounds, which are frequently encountered in organic synthesis and analysis.
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Mar 12, 2025
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