NJC2026 Organic Chemistry Revision Booklet (MCQ) v2

Organic Chemistry Revision Booklet (MCQ) 2026 National Junior College 1 Name: _____________________ Class: _____________ Organic Chemistry Revision Booklet (MCQ) Content Page General Properties of Organic Molecules 2 Combustion of Organic Molecules 5 Calculations involving Organic Molecules 7 Isomerism 8 Organic Reactions / Synthesis 13 Organic Reaction Mechanism 38 Hydrolysis of Organic Molecules 51 Distinguishing Test 57 Pattern Identification 59 Amino acids and Proteins 69

Organic Chemistry Revision Booklet (MCQ) 2026 National Junior College 2 General properties of organic compounds 1. Which property of benzene may be directly attributed to the stability associated with its delocalized electrons? A It does not conduct electricity. B Its enthalpy change of formation is endothermic. C It is susceptible to attack by nucleophiles. D It tends to undergo substitution rather than addition reactions. 2. Which statement is true regarding the formation of chlorobenzene from benzene and chlorine? A A catalyst is not required for the reaction to take place. B The six carbon atoms in benzene remain sp2 hybridised throughout the reaction. C The relative molecular mass of the organic product is 35.5 greater than that of benzene. D The reaction involves an intermediate which contains 4 delocalised electrons 3. Which statement best explains why the boiling point of butanal (76 oC) is higher than that of pentane (36 oC)? A There are permanent dipole -permanent dipole interactions between butanal molecules, but not between pentane molecules. B There are hydrogen bonds between butanal molecules, but not between pentane molecules. C The butanal molecule has a larger surface area than the pentane molecule. D The covalent bonds in the butanal molecule are stronger than those in the pentane molecule. 4. Amino acids have comparatively high melting points when compared with other organic compounds of similar mass. Which statement best explains this observation? A In the solid state, amino acids are held together by strong hydrogen bonds. B In order to melt an amino acid, strong covalent bonds are broken. C Amino acids are held together by ionic bonding. D Amino acids are held in fixed positions in a solid lattice. 5. The diagram below represents a section of a catalytic converter on the exhaust system of a car. Which statement is incorrect regarding the processes that occur in the catalytic converter? A Platinum and rhodium catalyse the redox reactions in the catalytic converter. B Carbon monoxide and nitrogen oxide react together. C Carbon monoxide and hydrocarbons react together. D Mixture X contains carbon dioxide, nitrogen and water vapour. platinum and rhodium catalyst X CO hydrocarbons NOx

Organic Chemistry Revision Booklet (MCQ) 2026 National Junior College 3 6. 7.

Organic Chemistry Revisi