It belongs to a homologous series with general formula C n H 2n+1 O

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Elwin Little
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1 1 Propene can be made by the dehydration of propan-2-ol. What is the percentage yield when 30 g of propene (M r = 42.0) are formed from 50 g of propan-2-ol (M r = 60.0)? 60% 67% 81% 86% 2 Which statement about ethanal is correct? It reacts with Tollens reagent to form silver. It has a higher boiling point than ethanol. Its empirical and molecular formulas are different. It belongs to a homologous series with general formula n H 2n+1 O 3 Which one of the following is not a correct statement about vitamin, shown below? It is a cyclic ester. It can form a carboxylic acid on oxidation. It decolourises a solution of bromine in water. It is a planar molecule. Page 1 of 9

2 4 Which one of the following reactions will produce an organic compound that has optical isomers? dehydration of butan-2-ol by heating with concentrated sulphuric acid reduction of pentan-3-one by warming with NaH 4 addition of r 2 to 3-bromopropene reduction of 2,3-dimethylpent-2-ene with H 2 in the presence of a nickel catalyst 5 Which one of the following is not a correct general formula for the non-cyclic compounds listed? alcohols n H 2n+2 O aldehydes n H 2n+1 O esters n H 2n O 2 primary amines n H 2n+3 N 6 For this question refer to the reaction scheme below. Which one of the following statements is not correct? Reaction of W with sodium cyanide followed by hydrolysis of the resulting product gives propanoic acid. Mild oxidation of Z produces a compound that reacts with Tollens reagent, forming a silver mirror. Z reacts with ethanoic acid to produce the ester propyl ethanoate. W undergoes addition polymerisation to form poly(propene). Page 2 of 9

3 7 For this question refer to the reaction scheme below. Which one of the following reagents would not bring about the reaction indicated? Step 1 : alcoholic KOH Step 2 : aqueous r 2 Step 3 : aqueous NaOH Step 4 : concentrated H 2 SO 4 8 For this question refer to the reaction scheme below. Which one of the following statements is not correct? W and Y are structural isomers. Z is a primary alcohol. Y gives two peaks in its proton n.m.r. spectrum. X has geometrical isomers. Page 3 of 9

4 9 ertain chemical tests were performed on the pain-relief drug ibuprofen. The results of these tests are given in the table below. Test queous sodium carbonate romine water cidified potassium dichromate(vi) and heat Fehling s solution and heat Result Effervescence Remained orange Remained orange Remained blue Which one of the following functional groups do these results suggest that ibuprofen contains? 10 Which one of the following mechanisms is not involved in the reaction sequence below? H 3 H 3 H 3 H 2 l H 3 H 2 OH H 2 =H 2 H 3 H 2 r electrophilic addition electrophilic substitution nucleophilic substitution free-radical substitution Page 4 of 9

5 11 Which one of the following alcohols forms a mixture of alkenes when dehydrated? propan-1-ol propan-2-ol pentan-1-ol pentan-2-ol 12 Which one of the following isomers is not oxidised under mild reaction conditions? (H 3 ) 2 HH(OH)OH 3 (H 3 ) 2 (OH)H 2 OH 3 (H 3 ) 2 HH(OH)H 2 HO (H 3 ) 2 (OH)H 2 H 2 HO 13 In which of the following is a curly arrow used incorrectly? Page 5 of 9

6 14 H 2 O is the empirical formula of methanol methyl methanoate ethane-1,2-diol butanal 15 Which one of the following does not represent an oxidation? propene propane propan-l-ol propanal propan-l-ol propanoic acid propanal propanoic acid 16 Which one of the following is not a suitable method for the preparation of ethanol? oxidation of ethane hydration of ethene reduction of ethanal hydrolysis of bromoethane 17 Which one of the following cannot be produced by oxidation of propan-l-ol? carbon dioxide propanone propanal propanoic acid Page 6 of 9

7 18 Which of the following compounds would form an orange-red precipitate when heated with Fehling s solution? H 3 H 2 N H 3 H 2 OOH H 3 HO H 3 OH 3 19 This question is about the reaction between propanone and an excess of ethane-1,2-diol, the equation for which is given below. In a typical procedure, a mixture of 1.00 g of propanone, 5.00 g of ethane-1,2-diol and g of benzenesulphonic acid, 6 H 5 SO 3 H, is heated under reflux in an inert solvent. enzenesulphonic acid is a strong acid. The products would not have an absorption in the infra-red at 1050 cm cm cm cm Which one of the following statements about but-2-enal, H 3 H=HHO, is not true? It has stereoisomers. It shows a strong absorption in the infra-red at about 1700 cm 1. It will turn an acidified solution of potassium dichromate(vi) green. It can be dehydrated by concentrated sulphuric acid. Page 7 of 9

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A drug is designed to simulate one of the following molecules that adsorbs onto the active site of an enzyme.

A drug is designed to simulate one of the following molecules that adsorbs onto the active site of an enzyme. 1 drug is designed to simulate one of the following molecules that adsorbs onto the active site of an enzyme. Which molecule requires the design of an optically active drug? 2 Which one of the following