SCC1226 Organic Chemistry & Biochemistry Exam Review - OCR

SCC1226: Introduction to Organic Chemistry and Biochemistry Review of Modules 1-6 1 Final Exam Section 1: 20 Multiple choice questions (30 marks) Section 2: 14 Short answer questions (130 marks)...

SCC1226: Introduction to Organic Chemistry and Biochemistry Review of Modules 1-6 1 Final Exam Section 1: 20 Multiple choice questions (30 marks) Section 2: 14 Short answer questions (130 marks) 2  Section 1: Q1 1 2 3 6 H C C CH2 CH3 C C Br 4 5 Br 1. Which of the following statements about the molecule is true? A. The bond between carbon 1 and carbon 2 consists of two sigma bonds and one pi bond. B. There are total of ten sigma bonds in this molecule. C. The bond between carbon 5 and carbon 6 is sp2-sp3 orbital overlap. D. The bond between carbon 1 and carbon 2 is sp2-sp2 overlap. 3  Section 1: Q3 and Q4 3. Which of the following statements about boiling points is true? A. Chloromethane has a higher boiling point than chloroethane. B. Ethanoic acid has a higher boiling point than propanoic acid. C. Ethoxy pentane has a higher boiling point than heptanal. D. Butanamine has a higher boiling point than diethyl ether. 4. Which of the following statements is true? A. Carbon hydrogen bonds are polar due to the very different electronegativity values for the two atoms. B. In the carbonyl functional group, there is uneven sharing of electrons in the bond, so that the carbon is slightly negative and the oxygen slightly positive. C. Hydrocarbons are non-polar and can only participate in dispersion forces. D. Carboxylic acids are very polar so they are always soluble in water. 4  Section 1: Q6 6. Which of the following pure substances has hydrogen bonding? i. 3-oxo-2-butanone ii. 2-aminopropanal iii. Pentanoic acid iv. Propyl acetate A. (i) and (iv) have hydrogen bonding. B. (ii) and (iii) have hydrogen bonding. C. (i), (ii) and (iii) have hydrogen bonding. D. All of these pure substances have hydrogen bonding. 5  Section 1: Q7 7. Which of the following statements about esters is true? (i) Esters have pleasant, fruity odours. (ii) Ethanol and pentanoic acid react to form ethyl pentanoate. (iii) Hydrolysis of butyl hexanoate will form hexanol and butanoic acid. (iv) The esterification reaction is not reversible. A. (i), (ii) and (iii) are true. B. (i), (ii) and (iv) are true. C. (i), (iii) and (iv) are true. D. (i) and (ii) are true. 6  Section 1: Q16 and Q17 16. Which of the following is not an oxidising agent? A. Hydrogen gas with a metal catalyst B. Tollens’ reagent C. Acidified potassium dichromate D. Ozone gas 17. Which of the following products is formed when hydrogen/Pt catalyst is reacted with 3- ethylpentanoic acid? A. Primary alcohol B. Secondary alcohol C. Tertiary alcohol D. None of the above 7  Section 1: Q19 19. Which of the following statements about intermolecular forces is true? A. In pure ketone solution, the ketone molecules can undergo hydrogen bonding with each other. B. Alkenes can undergo dipole dipole interactions unlike alkanes. C. In water, aldehydes can hydrogen bond with water molecules. D. Carboxylic acids have strong hydrogen bonding because of the long hydrocarbon chain. 8 Section 2: Q1 3-ethyl-4-fluoro-2-hydroxyheptanal propyl benzoate 2-chloro-3-methylhexenoic acid 9 Section 2: Q2 10 Section 2: Q2 11 Section 2: Q2 12 Section 2: Q6 13 Section 2: Q6 14 Section 2: Q10 15 Section 2: Q10 16 Section 2: Q10 17 Section 2: Q3 18 Section 2: Q3 19