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Chem 103: Organic Chemistry Question Paper
Chem 103: Organic Chemistry
Course:Bachelor Of Science In (Animal Science, Agriculture, Environmental Science, Horticulture, Wildlife Enterprise Management, Agricultural Economics & Agricultural Education And Extension)
Institution: Chuka University question papers
Exam Year:2013
CHUKA
UNIVERSITY
UNIVERSITY EXAMINATIONS
FIRST YEAR EXAMINATION FOR THE AWARD OF DEGREE OF
BACHELOR OF SCIENCE IN (ANIMAL SCIENCE, AGRICULTURE, ENVIRONMENTAL SCIENCE, HORTICULTURE,
WILDLIFE ENTERPRISE MANAGEMENT, AGRICULTURAL ECONOMICS &
AGRICULTURAL EDUCATION AND EXTENSION)
CHEM 103: ORGANIC CHEMISTRY
STREAMS: BSc (ANSC, AGRIC, ENSC, HORT, TIME: 2 HOURS
WIEM, AGEC, AGED)
DAY/DATE: MONDAY 12/8/2013 11.30 A.M. – 1.30 P.M.
INSTRUCTIONS:
Answer question One (1) (30 Marks) and any other two questions (40 Marks)
Question One (30 Marks)
1. (a) Define catenation and give two elements that catenate apart from carbon.
[3 marks]
(b) Briefly describe the three common modes of hybridization observed in organic molecules. [6 marks]
(c) (i) What is a functional group? [2 marks]
(ii) Briefly discuss a carbonyl group as a functional group. [3 marks]
(d) Give any three properties of a molecule that are determined by functional group.
[3 marks]
(e) Draw the molecular structures of the following molecules. [6 marks]
(i) 4-ethyl-2-methylheptane
(ii) Ethylcyclopentane
(iii) 3-methylhex-3-ene
(iv) 4-methylhex-1-yne
(v) 2-methylpropanal
(vi) Cyclohexylamine
(f) Name the following compounds according to the IUPAC system of nomenclature.
[7 marks]
Question Two (20 Marks)
2. (a) Briefly describe how alkanes are prepared by the following methods giving the
general equation of reaction. [12 marks]
(i) Hydrogenation of alkanes
(ii) Reduction of alkyl lichides
(iii) Reaction of sodium salt of carbonylic acid and sodalime.
(b) Briefly explain the boiling point trends of alkanes. [4 marks]
(c) Briefly discuss substitution reactions of alkanes (No mechanism of equations required). [4 marks]
Question Three (20 Marks)
3. (a) Describe how ethene would be prepared in the laboratory and in industries. Give
the equation of reaction. [5 marks]
(b) Explain solubility of alkenes. [4 marks]
(c) Complete the equations below [6 marks]
(d) What is hydroboration-oxidation reaction? Write the general reaction equation.
[3 marks]
(e) Give two reactions of aldehydes. [2 marks]
Question Four (20 Marks)
4. (a) Discuss hydration of alkynes giving at least two relevant examples. [6 marks]
(b) Give the reagents and/or condition necessary for the following alkynes reactions.
[6 marks]
(c) What impurity is present in commercial calcium carbide (that is used to prepare ethyne) and what is its effect during ethyne preparation? How is it removed?
[3 marks]
(d) (i) What is a phenol? Draw its structure. [2 marks]
(ii) Give three reactions of phenols. [3 marks]
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