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IJC/PRELIM 2009/P1/Q2525 Enols, also known as alkenols, are alkenes with a hydroxyl group affixed to one ofthe carbon atoms composing the double bond. Enols and carbonyl compounds arerapidly interconvertible via a process called tautomerism.OCHCrapid equilibrationOCCHenolcarbonyl compoundThe enol form is usually unstable and difficult to isolate and are present only to avery small extent at equilibrium.Propane-1,2-diol can undergo dehydration with excess concentrated H 2 SO 4 togive enols and a mixture of products. Which of the following is false about theresulting solution?ABCDIt decolourises hot acidified potassium manganate (VII) solution with theevolution of a colourless gas.It gives a yellow precipitate with aqueous alkaline iodine.It gives a grey precipitate with silver diammine complex.It reacts with cold alkaline potassium manganate (VII) solution to give anoptically active product.IJC/PRELIM 2009/P1/Q2626 Which of the following statements is false?ABCDDenaturation does not affect the primary structure of proteins which impliesthat there is no breakage of the peptide bonds.In an alpha helix, the amide carbonyl oxygen of an amino acid residue n ishydrogen bonded to the amide hydrogen of residue n+4.The formation of the peptide link between amino acids is irreversible.The quaternary structure only applies to proteins that contain two or morepolypeptide chains.© SAJC Chemistry Unit 2009 16
CJC/PRELIM 2009/P1/Q19Athletes preparing for the Youth Olympics Games (YOG) in 2010 follow a highcarbohydratediet to maintain high-intensity exercise for a longer period.Glucose is an important carbohydrate in biology as the living cell uses it as a source ofenergy and metabolic intermediate.glucoseHow many stereoisomers does glucose exhibit?A 2 1 B 2 2 C 2 3 D 2 4CJC/PRELIM 2009/P1/Q2020 The equation below represents the sulfonation of benzene under suitableconditions.+ H 2 SO 4 SO 3 H + H 2 OWhat is the role of concentrated sulfuric acid in the reaction?A a dehydrating agentC a nucleophilic agentB an electrophilic agentD an oxidising agentCJC/PRELIM 2009/P1/Q2121 Chlorofluorocarbons, commonly known as CFCs, undergo homolytic fission byultraviolet irradiation in the stratosphere. Which radical could result from thisirradiation of CHFClCF 2 Cl?•A CHFClCFClB •CHClCF 2 ClC •CHFCF 2 ClD •CFClCF 2 Cl© SAJC Chemistry Unit 2009 17
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Page 30 and 31: DHS/PRELIM 2009/P1/Q2323 A student
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CH 3HO (CH 2 ) 4 CH 3CH 3 - O (CH 2
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CH(OH)CH 3D+ alkaline aqueous iodin
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D 9 4SRJC/PRELIM2009/P1/Q23Which of
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CH 2 CH 2 CO 2 H│(CH 3 ) 2 CHCH(N
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TPJC/PRELIM2009/P1/Q20TPJC/PRELIM20
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VJC/PRELIM2009/P1/Q19The hydride io
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VJC/PRELIM2009/P1/Q24Which process
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VJC/PRELIM2009/P1/Q26Compound X is
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YJC/PRELIM2009/P1/Q18YJC/PRELIM2009
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MCQ - Section BACJC/PRELIM 2009/P1/
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3 The enthalpy change of hydrogenat
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CJC/PRELIM 2009/P1/Q3939 Which of t
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2 (C 2 H 5 ) 2 NH3 (C 2 H 5 ) 3 NDH
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HCI/PRELIM 2009/P1/Q3939 Compound F
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2CONH 2CH 2 OHNH 23OH, , ,OHNJC/PRE
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PJC/PRELIM2009/P1/Q40© SAJC Chemis
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RIJC/PRELIM2009/P1/Q39RIJC/PRELIM20
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SAJC/PRELIM2009/P1/Q40Compound Q, w
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Which statements about pravastatin
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YJC/PRELIM2009/P1/Q40© SAJC Chemis
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