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Sch 2108 – Chemistry Ii Question Paper
Sch 2108 – Chemistry Ii
Course:Bachelor Of Science In Electrical And Electronic Engineering
Institution: Dedan Kimathi University Of Technology question papers
Exam Year:2013
SCH 2108- Chemistry –II, Semester- II 2010/2011 Page 1 of 4
Page 1 of 4
DEDAN KIMATHI UNIVERSITY OF TECHNOLOGY UNIVERSITY EXAMINATIONS 2013/2014 YEAR ONE SEMESTER II EXAMINATION FOR DEGREE OF BACHELOR OF SCIENCE – ELECTRICAL & ELECTRONICS ENGINEERING , CIVIL AND MECHATRONIC ENGINEERING SCH 2108 – Chemistry II DATE: 16th DECEMBER 2013 TIME: 2.00 pm – 4.00 pm INSTRUCTIONS: Answer Question ONE and any other TWO questions QUESTION ONE (30 MARKS) 1. a) Name the following compounds using IUPAC system; CH2CH3
i) CH3-C-CH2-CH2-CH-CH2-CH3
CH3 Cl 1mk
ii) CH3C C CH2 CH2 C C CH2 CH3 1mk
NH2 iii) CH3CH-CH2CH2COOH 1mk
OH O
iv) CH3CH2 – CH CH2 C H 1mk b) Draw the structural formulae of the following compounds; i) 3, 5-Dimethylcyclohexene ii) 2-Amino-1-bromopentane iii) 2, 4, 6-Trichlorophenol iv) 2-Chlorobutanoic acid v) 4-Chloro-2, 4-dimethyl-2-pentene vi) Ethane-1, 2-diol (each 1mk)
SCH 2108- Chemistry –II, Semester- II 2010/2011 Page 2 of 4
Page 2 of 4
c) Complete the following reactions by giving the name and structure the product(s) formed; Mg , ether H20
i) CH3CH2 CH CH3 ? ? 2mks Br
ii) CH3CH2- CH = CHCH3 + O2 Ag ? 1mk 1). O3
iii) CH3CH = CHCH2CH3 ? 2mks 2). Zn/H2O CH3
iv) H2N.CH2.CO2H + H2N.CH.CO2H ? 2mks Glycine Alanine Polymerise
v) CH CH + HCl CH2 CHCl ? 1mk d) Explain briefly the following; i) Alkanes are generally used as fuels. 2mks ii) Detergents have a superior cleansing power than soap. 2mks iii) Alcohols have higher boiling points than alkanes of comparable molecular weight. 2mks iv) Aldehydes are more reactive than ketones. 2mks v) Phenol is more acidic than ethanol. 2mks vi) When Fehling’s solution is mixed with starch, no reaction takes place when warmed gently. However, after a prolonged heating, the solution turns green. 2mks
SCH 2108- Chemistry –II, Semester- II 2010/2011 Page 3 of 4
Page 3 of 4
QUESTION TWO (20 MARKS) 2. a) Using relevant examples, differentiate between a phenol and an aromatic alcohol. 2mks b) Alkanes react with halogens to give halogenoalkanes (alkyl halides). i) What conditions are necccessary for the reaction to take place? 1mk ii) Why is this method not a good way of making halogenoalkanes. 2mks c) Explain how you would distinguish between propene and propane 2mks d) Name and draw the structures of alkanes that would be formed if chloromethane and chloroethane reacts as per Wurtz reaction. 3mks e) i) State the Saytzeff’s rule. 2mks ii) Applying the above rule, name and draw the products formed from the following reaction.
CH3-CH2-CH-CH3 H2SO4 ? Heat OH 4mks iii) Explain the importance of ozonolysis as applied to alkenes. 2mks f) Write the structural formulas of the following compounds i) 3, 3 Diethyl-5-methyldecane. 1mk ii) 2, 2, 5-Trimethylhex-3-ene 1mk QUESTION THREE (20 MARKS) 3. a) i) Write an equation for the reaction between two propanal molecules and indicate the name and the structural formula of the organic product. 3mks ii) State the type of reaction which takes place. 1mk b) For the substance of molecular formula C6H12O6, give the names and structures of isomers which contain a carbonyl (>C= O) group and at least a primary alcoholic (- CH2OH) group. 4mks c) A test tube contains a liquid X, which is either methanal, (formaldehyde), ethanal, (acetaldehyde) or propanone (acetone). Describe the chemical tests which you would carry out on X to establish its identity. Include chemical names of reagents, equations for the reactions and observations in each case. 6mks d) An alcohol has the formula, C6H11-OH. It does not react with bromine or bromine water. i) What does the information about bromine tell you about the alcohol? 1mk ii) What is the structure of the alcohol? Suggest its name. 2mks e) Using chemical equations for the reactions, illustrate the reactivity of phenol due to the ring using; i) Chlorine in aqueous solvent ii) Concentrated nitric acid Give the structures and names the products formed in each case. 4mks
SCH 2108- Chemistry –II, Semester- II 2010/2011 Page 4 of 4
Page 4 of 4
QUESTION FOUR (20 MARKS) 4. a) i) Explain what you understand by the terms ‘iodine and saponification value’ of fats and oils 2mks ii) Explain the cleansing action of soap. 4mks b) Discuss how water hardness interferes with the cleansing action of soap. 4mks c) Give an account of the experimental evidence for the assumption that a molecule of glucose has; i) Straight chain of six carbon atoms 2mks ii) Five –OH groups 2mks iii) An aldehyde group 2mks d) i) Differentiate between a- and ß-D- Glucose. 2mks ii) Outline the processes involved in preparing crystalline cane sugar from cane sugar or sugar beet. 2mks QUESTION FIVE (20 MARKS) 5. a) State the two common methods available for the separation of a mixture of amino acids. 2mks b) Consider the short peptide below; O O
H2N-CH2-C- N-CH2-C-N-CH-COOH H H CH2CH3 i) How many amino acid residues does it contain? 1mk ii) Name the above peptide accordingly. 1mk iii) Give the structures of the amino acids used to build the chain. 3mks c) Explain the meanings of the following terms as applied to proteins; i) The peptide bond ii) A zwitterion iii) Primary structure iv) Essential amino acids (each 1mk) d) i) Give an account of the free radical addition polymerization. 3mks ii) Differentiate between atactic and isotactic polymers. 2mks iii) Nylon -6,6 can be made by reacting hexane-1,6-diamine , H2N-(CH2)6-NH2 with hexanedioyl dichloride, ClOC-(CH2)4- COCl. Draw a portion of this polymer chain. 1mk e) Differentiate between simple and conjugated proteins. 3mks
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