Lesmahagow High School

Transcription

1 Lesmahagow High School Higher hemistry Unit 2 Tutorial Questions 1

2 Multiple hoice 1. The conversion of linoleic acid, 18 H 32 O 2, into stearic acid, 18 H 36 O 2, is likely to be achieved by hydrogenation hydrolysis hydration dehydrogenation. 2. Which of the following could be used to oxidise an alcohol to the corresponding organic acid? Phosphorus pentachloride luminium oxide opper(ii) oxide Sodium 6. Which of the following hydrocarbons immediately decolourises bromine water? yclohexane Methylpentane Hexane yclohexene 7. Which compound has a formula mass of 84 amu? Hexane Hexene yclohexene Methylpentane 3. Which of the following compounds has isomeric forms? 8. Which of the following compounds is hydrolysed when warmed with sodium hydroxide solution? 2 H 3 l 2 H 5 l 2 Hl 3 2 H 4 l 2 4. Which hydrocarbon is not a member of the same homologous series as the others? Relative formula mass Which of the following is true of alkanones? They are formed by oxidation of primary alkanols. They can be easily oxidised to acids They may contain the structure They will reduce Fehling s (enedict s) solution. 2

3 9. Which of the following is an aldehyde? 12. The structural formula for glycerol is 10. The above molecule can be classified as an amino acid an ester a peptide a protein. 11. Propanoic acid is reacted with ethanol. The formula for one of the products is 13. Which is true of a compound with the following formula? H 3 H(OH)H 3 It is a primary alcohol. It can be a tertiary alcohol. It is a tertiary alcohol. It can be oxidised to a ketone. 14. Rum flavouring is based on the compound with the formula shown: It can be made from ethanol and butanoic acid propanol and ethanoic acid butanol and methanoic acid propanol and propanoic acid. 3

4 15. Essential amino acids are defined as the amino acids which are necessary for building polypeptides humans must acquire through their diet plants cannot synthesise for themselves are produced when any protein is hydrolysed. 16. In which of the following kinds of compounds is nitrogen always present? Enzymes Oils Polyesters arbohydrates 4

5 17. Which process is represented by the following equation ondensation Hydrolysis Oxidation ehydration 5

6 18. Which of the following is an ester? 19. Fats and oils can be classified as Soaps Fatty acids Esters Polyesters. 6

7 20. On complete hydrolysis, a peptide produced 5 amino acids represented by the letters P, Q, R, S and T. The following fragments were produced on partial hydrolysis: Which of the sequences below could be the correct one for the arrangement of amino acids in the peptide? 21. Methanol may be converted to methanal by oxidation hydration cracking condensation. 7

8 Written Questions Marks (a) i) Which type of chemical reaction occurs when butan-1-ol reacts with ethanoic acid in the presence of concentrated sulphuric acid? ii) raw the full structural formula for the organic product in (c ) (i)

9 2. Marks The reaction scheme shows a number of common reactions (a) Name compounds P, Q, R and S. 2 (b) State the types of chemical reaction occurring at (1) and (2). 2 (c) Write a structural formula for compound Y. 1 (d) escribe a chemical test you could use to distinguish between compound Q and propanone. 2 (e) Name the class compounds to which Z belongs 1 3. a). Give the systematic names of the two compounds which, when warmed with concentrated sulphuric acid, react to form the above compound. 2 9

10 4. In the flow diagram, compound is converted into a mixture of and, which are in turn converted into other products as shown. (a) Name compound G. 1 (b) Which two compounds are isomeric? 1 (c) State the type of reaction which converts compound to I 1 (d) What would be observed during the conversion of i) ompound to I; 2 ii) ompound I to J? 2 10

11 5. Mutton fat contains a compound called tristearin. Trisearin is hydrolysed in the body during digestion by an enzyme known as lipase. (a) Give one reason why fats can be a useful part of a balanced diet. 1 (b) To which set of compounds do enzymes belong? 1 (c) The hydrolysis of tristearin produces a fatty acid. Name the other product of this reaction. 1 (3) 11