OCR a level chemistry organic chemistry Study guides, Class notes & Summaries

OCR A Level Chemistry A (H432) Chemistry B (H433) PAG 5: Synthesis of an organic liquid Practice Exam Questions and Mark Scheme 1. Ethanol is oxidised to ethanoic acid using acidified potassium dichromate(IV) solution. The reaction is heated under reflux using the equipment shown in the diagram below. What is the reason for heating under reflux? A. to ensure even heating B. to prevent any substances escaping C. to boil the mixture at a higher temperature D. to allow efficient mixing Yo...

OCR A LEVEL CHEMISTRY ORGANIC SYNTHESIS WITH COMPLETE SOLUTIONS alkene undergoes what type of polymerisation - CORRECT-addition  polymerisation Alkene to alcohol - CORRECT -Electrophilic addition  conc (phosphoric) acid catalyst  steam Haloalkane to nitrile - CORRECT -nucleophilic substitution ethanolic NaCN or KCN heat Haloalkane to primary amine (also makes NH4X) - CORRECT -Nucleophilic  substitution  Excess ethanolic NH3 with no further substitution HEAT under PRESSURE ac...

OCR A LEVEL CHEMISTRY ORGANIC SYNTHESIS WITH COMPLETE SOLUTIONS alkene undergoes what type of polymerisation - CORRECT-addition  polymerisation Alkene to alcohol - CORRECT -Electrophilic addition  conc (phosphoric) acid catalyst  steam Haloalkane to nitrile - CORRECT -nucleophilic substitution ethanolic NaCN or KCN heat Haloalkane to primary amine (also makes NH4X) - CORRECT -Nucleophilic  substitution  Excess ethanolic NH3 with no further substitution HEAT under PRESSURE ac...

OCR A LEVEL ORGANIC CHEMISTRY YEAR 12 WITH VERIFIED QUESTIONS AND ANSWERS What is the melting and boiling points of alkanes like? - ANSWER--as chain length increases so does the strength of the intermolecular forces as there is greater surface area for contact between molecules and hence stronger london forces and therefore the melting/boiling points are highr for longer chain. What is a structura/chain isomer? - ANSWER--Same molecular formula but a different structural formula Wh...

OCR A LEVEL CHEMISTRY A CHEMISTRY B SYNTHESIS OF AN ORGANIC LIQUID EXAM QUESTIONS AND CORRECT ANSWERKEY

OCR A LEVEL CHEMISTRY ORGANIC SYNTHESIS WITH COMPLETE SOLUTIONS alkene undergoes what type of polymerisation - CORRECT-addition  polymerisation Alkene to alcohol - CORRECT -Electrophilic addition  conc (phosphoric) acid catalyst  steam Haloalkane to nitrile - CORRECT -nucleophilic substitution ethanolic NaCN or KCN heat Haloalkane to primary amine (also makes NH4X) - CORRECT -Nucleophilic  substitution  Excess ethanolic NH3 with no further substitution HEAT under PRESSURE ac...

OCR A Level Chemistry A (H432) Chemistry B (H433) PAG 5: Synthesis of an organic liquid Practice Exam Questions and Mark Scheme

Alkene + hydrogen /nickel catalyst/423K= - correct answer alkane Alkene + bromine /room temperature= - correct answer dihaloalkane Alkene + HCl(g/aq) /room temperature= - correct answer haloalkane (mixed products) Alkene + H2O(g) /H3PO4= - correct answer alcohol (mixed products) Primary alcohol + 2[O] /excess K2Cr2O7/H2SO4/reflux= - correct answer carboxylic acid Primary alcohol + [O] /K2Cr2O7/H2SO4/distil= - correct answer aldehyde Secondary alcohol + [O] /K2Cr2O7/H2SO4/reflux...

OCR AS LEVEL CHEMISTRY A H432/02 SYNTHESIS AND ANALYTICAL TECHNIQUES GENUINE 2024 EXAM COMPLETE EXAM WITH CORRECT WELL DEFINED ANSWERS INNIT A+ ASSURED CHECK THE LAST PAGE FOR ANSWERS 1 What is the name of the compound below? H3C C CH2CH3 C H Br A E-3-bromopent-2-ene B E-3-bromopent-3-ene C Z-3-bromopent-2-ene D Z-3-bromopent-3-ene Your answer [1] 2 Which statement about bonds is correct? A The C=C bond in ethene is more polar than the C−C bond in etha...