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- Plastic photochromic sunglasses are based on the following reversible rearrangement of a dye inside the lenses that occurs when the lenses are exposed to sunlight. The original dye absorbs UV light but not visible light and is thus colorless, while the rearrangement product absorbs visible light and is thus darkened. (a) Show the mechanism of the rearrangement. (b) Why does the rearrangement product absorb at a longer wavelength (visible light) than the original dye (UV)?Melamine, used as a fire retardant and a component of the writing surface of white boards, can be prepared from s-trichlorotriazine through a series of SNAr reactions with ammonia. The first substitution takes place rapidly at room temperature. The second substitution takes place near 100 °C, and the third substitution requires even higher temperature and pressure. Provide an explanation fatr this reactivity.Which alkene is the most stable A В D A B
- Give the major substitution product of the following reaction. Br O CH3CO₂H Save for Later heat OH OMe ? There is no reaction under these conditions or the correct product is not listeZaitsev's Rule refers to: which alkene is favored in a product mixture O how resonance contributors stabilize cations/anions/radicals O the stereochemistry of reaction intermediates/transition states O the stability of carbocation intermediatesWhat is the predicted product of the reaction shown? ОТ O II O ||| O IV OV Н Na2Cr2O7/H2SO4/H2O IV || ОН ОН овог H V Ш OH ОН
- Which is the major organic product of the reaction provided? O A O B O U A) ex Br B) Br₂, hv Br xx xx xx Br D) racemicGive the major substitution product of the following reaction. a O CH3CO₂H Br heat CH₂ ? O There is no reaction under these conditions or the correct product is not listed here.Draw the major product of the reaction shown. OI O III O IV OV eTextbook and Media OMe = CI = ||| oto IV V ||
- 4) Give the correct product with the correct stereochemistry. Me Me 5) Give the major product. hv HCI OCONZ IS ON Determine which substitution mechanism occurs and draw the products, including stereochemistry. + -OCH3 DMSO Br H + CH3OH Br CH,CH, CH3What is the predicted product of the reaction shown? || снобоон CH3COOH III IV V