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Sch 2108 – Chemistry-Ii Question Paper
Sch 2108 – Chemistry-Ii
Course:Civil And Mechatronic Engineering
Institution: Dedan Kimathi University Of Technology question papers
Exam Year:2013
SCH 2108 – Chemistry-II , Special/Supplementary-2009/2010 Page 1 of 3
KIMATHI UNIVERSITY COLLEGE OF TECHNOLOGY UNIVERSITY EXAMINATIONS 2009/2010 YEAR ONE SEMESTER II EXAMINATION FOR DEGREE OF BACHELOR OF SCIENCE – ELECTRICAL & ELECTRONICS ENGINEERING , CIVIL AND MECHATRONIC ENGINEERING SCH 2108 – Chemistry II SPECIAL/SUPPLEMENTARY EXAMINATION DATE: MAY 2010 TIME: 2 Hours INSTRUCTIONS: Answer Question ONE and any other TWO questions QUESTION ONE (30 MARKS) 1. (a) Name the following compounds using IUPAC system; CH3
i) CH3 CH-CH-CH2-CH3
CH3 1mk
O ii) CH3CH2 - C – H 1mk
Cl Br iii) CH3C – CH-CH3 1mk
iv) CH3-C = CH-CH2 -C CH CH3 1mk b) Write the structural formulae for; i) 1, 3- Diiodobutene ii) Propanone iii) 1,3-Butadiene iv) 2-Nitrophenol each 1mk
SCH 2108 – Chemistry-II , Special/Supplementary-2009/2010 Page 2 of 3
c) Identify the major product(s) in the reaction schemes below.Name and draw their structural formulae
i) CH3CH2- C = CHCH3 + HBr Peroxide ? 1mk CH3
O
ii) CH3CH2 - C – H + CH3MgBr ? H2O / H+ ? 2mks
iii) 2CH3-Br + 2Na Ether ? 1mk Al2O3/Cr2O3
iv) CH3CH2CH2CH2CH2CH2CH3 ? 1mk 600OC-10atm d) Define the following terms; i) Amino acids ii) Proteins iii) Fertilizer iv) Isotactic polymer 4mks e) Distinguish between the following i) Essential and non-essential amino acids 2mks ii) Soap and a detergent 2mks iii) A thermoplastic and a thermosetting polymer 2mks iv) Glucose and sucrose 2mks f) Discuss the free radical reaction substitution of methane by a halogen and how the amount of the halogen or the alkane influences the major product formed 5mks QUESTION TWO (20 MARKS) 2.a) i) Describe briefly the refining of crude oil and the nature of the products obtained. 5mks ii)The discovery of crude has revolutionalized the chemical industry. Discuss briefly this statement. 2mks iii) Write all possible structural isomers of the alkane, C5H12. Name each isomer by IUPAC system 3mks b) The following compounds have the same molecular formula, C4H6O, A) CH3COCH2CH3 B) CH3CH2CH2CHO i) Give the IUPAC names of the the compounds A and B 2mks ii) Write down the structural formula and name of another aldehyde structurally isomeric with B 1mk iii) Illustrate one chemical reaction to distinguish between A and B 2mks iv) Explain why aldehydes and ketones have higher boiling points than alkanes of similar molecular weight 2mks c) Name and give the structures of carbonyl compounds formed after ozonolysis of the alkene, 2-methybut-2-ene , (CH3)2 C = CHCH3 3mks
SCH 2108 – Chemistry-II , Special/Supplementary-2009/2010 Page 3 of 3
QUESTION THREE (20 MARKS) 3. a) i) Describe using relevant equations, two general methods for the preparation of alkenes 4mks b) Name and draw the structure of the organic products formed when butene reacts with; i) Bromine in CCl4 2mks ii) Aqueous potassium permanganate 2mks c) i) Write the structural formulas for all alkyl bromides of the molecular formula C4H9Br. Name each according to the common IUPAC system. 4mks ii) 2-Bromobutane on dehydrohalogenation using alcoholic KOH yields two alkenes. Give the structures and IUPAC names of these alkenes and state with a reason the major (chief) product. 4mks d) i) Explain why alcohols with a long hydrocarbon tail (high molcular weight) are less soluble in water 2mks ii) State one similarity and one difference in the properties of phenol and ethanol 2mks QUESTION FOUR (20 MARKS) 4. a) Discuss briefly the chemistry of soap in relation to; i) Raw materials 2mks ii) Preparation. 5mks iii) Cleansing action. 5mks b) Why has soap been replaced to some extent by other detergents? 3mks c) Give the name and structure of one the synthetic detergent 5mks QUESTION FIVE (20 MARKS) 5. a) i) Draw the Fischer projection formula for the open straight-chain structure of glucose 1mk ii) What evidence is there in favour of this structure of glucose? 3mks b) Using this open chain structure of (+) - D-Glucose, illustrate its oxidation with i) Aqueous bromine ii) Nitric acid Name and draw the structures of the products formed in each case 3mks c) Discuss the major source and importance of any one of the following main classes of fertilizers; i) Nitrogeneous fertilizers ii) Phosphate fertilizers iii) Potash fertilizers 5mks d) What is polymerization? 2mks e) Name the monomer/ building block(s)and the strucure used in the formation of the following polymers; i) Polyethylene 1mk ii) PTFE(Teflon) 1mk iii) Proteins 2mks
iv) Nylon-6,6 2mks
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