Question

RTY Uno Collect the recrystallized product by vacuum filtration with the clamped Hirsch funnel and wash the crystals with 1 mL of cold, 50% aqueous ethanol. Then allow the crystals to air dry until the next laboratory period. Percent Yield and Characterization Weigh the dry product and calculate a percent yield. Then determine its melting point range and compare the result with the literature value. Submit the product in a labeled plastic bag with the report Questions 1. Use the curved-arrow notation to write a detailed mechanism for the conversion of the starting material, acetanilide, to the major product, p-bromacetanilide. Draw all intermediates and clearly show all structures canonical forms) that contribute to resonance-stabilized hybrids. 2. Why was cold, deionized water added to the reaction mixture after ten minutes? 3. Why was the crude product recrystallized? 4. Why was a Hirsch funnel, not a Buchner funnel used to collect the crystalline product? 5. Why was 50% aqueous ethanol, not hexane used for the recrystallization? 6. Why was a small, not a large amount of 50% aqueous ethanol used for the recrystallization?

Answer 1

Camin Answer Boa reB03 -p-boomo acetanildy Aretanilide mechanýms _Brobó teB82 - _BY-.--2694 गा AND @ At high temps acetanilide dissolve in water readily but is not ve insoluble in cold water that way cold water added. __ coule_poodust_contains some impunities & pap be starting material or side product. By using recrystallisation we can remove lunpysite from coude product they convertinto _punitied product T 6 chaore or Recrystallisation is carried out at small scave some time during crystallisaron a loss of whole product so .crystallisation is carried out at small scale, Harsch Funnel.: small scale _Buchner Funnel.' large scale (6) choice of solvent of coystallisalon. compoud gehoot should be insoluble at Room Temp. & high 4 soluble at high temp. In hexane compous ade soluble at room temp. Otherefore 50-1. ethanol used af coystallisason © P aboomo acetanilide axe_soluble in 100% etherol % ethanol increase solubility_of_product_increase therefore 594. ethanol used as Decoestelijas onFor - product