QQuestionChemistry
QuestionChemistry
The Diels-Alder reaction is a concerted reaction; this means:
a) the reaction is highly endothermic
b) the products contain rings
c) the reaction folows Markovnikov's rule
d) a mixture of endo and exo products are formed
e) all bond making and bond breaking occurs simultaneously
2) Which of the following compounds absorbs the longest wavelength of UV-visible light?
a) (E)-but- 2 -ene
b) (Z)- 1,3 -hexadiene
c) (E)- 1,3.5 -hexatriene
d) (Z)-but-ene
e) hex- 1 -ene
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Answer
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Step 1I'll solve this problem step by step, focusing on the UV-visible light absorption characteristics of these compounds.
Step 2: Understand the Factors Affecting UV-Visible Light Absorption
The wavelength of UV-visible light absorption depends on the conjugation and electron delocalization in the molecule. Key factors include: - Number of conjugated double bonds - Geometry of the conjugated system - Electron density in the π system
Final Answer
c) (E)- 1,3,5 -hexatriene will absorb the longest wavelength of UV-visible light due to its extensive conjugation of three double bonds.
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