17. Carbonyl compounds
A section of Chemistry, 9701
Listing 10 of 304 questions
Ethanoic acid, CH3CO2H and trichloroethanoic acid, CCl 3CO2H, are both carboxylic acids. Ethanoicacid can be used to make ethanamide, CH3CONH2. Place these three compounds in order of acidity, starting with the least acidic. Explain your answer. least acidic most acidic  Methanoicacid, HCO2H, and ethanedioicacid, HO2CCO2H, are two other carboxylic acids. State which, if any, of ethanoicacid, methanoicacid and ethanedioicacid will react with Fehling’s reagent. State which, if any, of ethanoicacid, methanoicacid and ethanedioicacid will react with warm acidified manganate(ions. Ethanamide can be made from ethanoicacid in a two-step synthesis. step 1 step 2 ethanoic acid A ethanamide CompoundA contains chlorine. Give the structural formula and name of A. structural formula name  Suggest suitable reagents for steps 1 and 2. step 1 step 2  CompoundA can also be used to make the amide CH3CONHC2H5. The proton NMR spectrum of the amide CH3CONHC2H5 in the solvent CDCl 3 is shown. δ / ppm Explain why CDCl 3 is used as a solvent instead of CHCl 3. Complete the diagram with the chemical shifts, δ, of the protons labelled in the CH3CONHC2H5 molecule. C O C H2 C H3 C H3 N H = = = =  State and explain how the proton NMR spectrum of the amide CH3CONHC2H5 differs when dissolved in D2O rather than CDCl 3. The mass spectrum of the amide CH3CONHC2H5 includes a fragment ion with m/e value of 58. Give the molecular formula of this fragment ion.  fragment ion with m/e value of 58 is The amide undergoes the following reaction to produce diethylamine. reagent B CH3CONHC2H5 C2H5NHC2H5 diethylamine Identify reagentB. State the number of different absorptions in the carbon‑13 NMR spectrum of diethylamine. 
9701_w20_qp_42
THEORY
2020
Paper 4, Variant 2
View
Questions Discovered
304