16. Hydroxy compounds
A section of Chemistry, 9701
Listing 10 of 190 questions
Prenol is a naturally occurring organic molecule found in many fruits. It contains both an alkene and an alcohol functional group. C C prenol H CH2OH H3C H3C Prenol can be formed by the reaction of G with NaOH. Complete the diagram to show the mechanism of the reaction between G and NaOHto form prenol. Include all relevant charges, partial charges, lone pairs and curly arrows. C C prenol H CH2OH H3C H3C C C G H C Cl H H H3C H3C  Prenol reacts with steam to form a mixture of three isomers, J, K and L, of molecular formula C5H12O2. When J is heated with excess acidified potassium dichromate(it forms an organic product which shows no reaction with 2,4‑DNPH. Draw the structure of J.  K and L are stereoisomers with molecular formula C5H12O2. K and L both react when heated with excess acidified potassium dichromate(to form M, C5H8O3. M forms an orange precipitate on reaction with 2,4‑DNPH. Give the structural formula of K and L. Name the type of stereoisomerism shown by K and L. Give the balanced equation to represent the reaction of K, C5H12O2, with acidified potassium dichromate(to form M, C5H8O3. Use to represent an atom of oxygen provided by the oxidising agent. Prenol contains an alkene functional group. Describe a chemical test to confirm the presence of an alkene functional group. Give the result of the test. Prenol can be polymerised to form poly. Draw one repeat unit of poly.  Isoprenol is a structural isomer of prenol. C C isoprenol CH3 CH2CH2OH H H The series of reactions shows how isoprenol can be used to form Q, a sweet-smelling liquid. isoprenol H2 and Ni reaction 1 acidified potassium dichromate(heat under reflux C2H5OH and H2SO4 heat under reflux N P O OH OH Q Give the name of N. Isoprenol is a liquid. Ni acts as a catalyst for reaction1. Identify the type of catalysis shown by Ni in reaction1. Draw the skeletal formula of Q and suggest one commercial use of Q. Q commercial use  P can be produced as shown. HCl H+ / H2O reaction I reaction II Cl reaction III C N O P OH The progress of reactionI can be monitored using infra-red spectroscopy. One absorption that can be used to monitor the progress of this reaction is that of C–Cl at 730 cm–1. Identify another absorption that can be used to monitor the progress of this reaction. In your answer, you should refer to the specific bond and its corresponding absorption range in wavenumbers. State the reagentneeded for reactionII. Name the type of reaction that occurs in reactionIII. The yield of reactionI is very low. Explain why. 
9701_w19_qp_22
THEORY
2019
Paper 2, Variant 2
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