OCR Module 4 Welcome to your OCR Module 4 Ethanol and methoxymethane are isomers of each other. What type of isomers are they? Functional group isomers Chain isomers Optical isomers Position isomers What type of isomers are 1-chlorobutane and 2-chlorobutane? Position isomers Chain isomers Optical isomers EZ isomers Which of the following are formed as a result of homolytic fission? Free radicals Simple ions Molecules Molecular ions Which of the following is(are) product(s) of complete combustion of alkanes?I. OxygenII. Carbon dioxideIII. Carbon monoxide II only I and II only I only III only Which of the following reactions can an alkane absolutely not undergo? Addition Substitution Combustion Alkanes can undergo all of the above reactions What is the mechanism of formation of chloroalkanes? Free radical substitution Electrophilic substitution Nucleophilic substitution Elimination Bromine reacts with alkenes at room temperature. What is the reaction mechanism? Electrophilic addition Nucleophilic addition Free radical addition Electrophilic substitution Which of the following is a correct condition of industrial hydration of alkenes? High pressure Low temperature The catalyst sodium hydroxide The presence of ethanol Which of the following does not exhibit EZ isomerism? But-1ene But-2-ene Pent-2-ene Hex-3-ene Butan-2-ol is reacted with concentrated sulphuric acid under reflux. How many isomers of an alkene are formed by this reaction? 3 2 1 4 Which of the following compounds gives propanone when heated under reflux with excess potassium dichromate? Propan-2-ol 2-methylpropan-2-ol Propan-1-ol Propanoic acid Which of the following is true about alcohols? Long chain alcohols are less soluble in water compared to short chain alcohols Primary alcohols oxidise to produce ketones Tertiary alcohols oxidise to produce ketones Hydrogen bonding allows them to be very volatile What is the product when 1-Bromo-3-methylbutane is reacted with KCN in an ethanol/water mixture? 3-methylbutanenitrile 2-methylbutanenitrile Pentanenitrile 1-bromobutane-3-nitrile What is the product when bromoethane is hydrolysed? Ethanol Ethanone Ethanal Ethanoic acid What is the role of chlorine free radicals in the depletion of the ozone layer? It acts as a catalyst It blocks UV light It prevents the ozone formation reaction All options are correct What is the product of the oxidation of aldehydes? Carboxylic acid Alcohol They cannot be oxidised Ketones The process by which poly(ethene) is made from ethene is called what? Addition polymerisation Condensation polymerisation Elimination reaction Substitution reaction What is the threshold wavenumber beyond which the fingerprint region in an IR spectrum starts? 1500 1700 2500 2000 Which of the following is a greenhouse gas?I. Carbon dioxideII. MethaneIII. Water I, II and III I only I and II only II only Time is Up!