A2 Chemistry - Rings, Polymer and Analysis 0.0 / 5 ? ChemistryAmines and azo dyesA2/A-levelOCR Created by: Amy CockingCreated on: 04-01-14 17:05 Bond angle and shape of a benzene molecule Trigonal planar and 120 1 of 42 Molecular formula of benzene C6H6 2 of 42 Structure of benzene P-orbitals have a sideways overlap above and below the planar ring, forming a pi-bond, causing electrons to be delocalised 3 of 42 Nitration of benzene equation Benzene + HNO3 ------> C6H5NO2 + water 4 of 42 Reagents and conditions of nitration of benzene Concentrated sulphuric acid and 50 C 5 of 42 Chlorination and bromination of benzene equation Benzene + Cl2/Br2 --------> C6H5Cl/Br + HCl/HBr 6 of 42 Conditions and reagents of bromination and chlorination of benzene FeCl3 or FeBr3 7 of 42 Chlorination and bromination of benzene require a special catalyst called....? A halogen carrier 8 of 42 Benzene can only undergo ............ reactions Electrophilic substitution reactions 9 of 42 Uses of phenol Pharmaceuticals, detergents, disinfectants and resin in paint 10 of 42 Primary alcohols oxidise to.....? Aldehydes and then carboxylic acids 11 of 42 Secondary alcohols oxidise to .....? Ketones 12 of 42 Tertiary alcohols oxidise to....? No change 13 of 42 The reagent to oxidise alcohols is? Acidified potassium dichromate, which will turn from orange to green 14 of 42 The reagent to reduce carbonyls is? Sodium borohydride ( NaBH4 ) 15 of 42 The reagent to detect a carbonyl compound is....? Brady's reagent ( 2,4-DNP) which will form a orange precipitate if present 16 of 42 To detect aldehydes, the reagent is .....? Tollen's reagent which will form a silver mirror if aldehydes are present 17 of 42 Reagents and conditions of acid hydrolysis of esters Heated under reflux, dilute sulphuric acid 18 of 42 Reagents and conditions of alkaline hydrolysis of esters Heated under reflux with sodium hydroxide 19 of 42 Nitrobenzene and nitroarenes are reduced using....? Tin, concentrated hydrochloric acid and heated under reflux 20 of 42 To form a diazonium ion, the mixture must be kept below....? 10 C 21 of 42 The reagents for the coupling reaction in an azo dye is....? Alkaline conditions 22 of 42 Zwitterion A dipolar ionic form of an amino acid that has no overall charge 23 of 42 Isoelectric point The pH value at which the amino acid exists as a zwitterion 24 of 42 Amino acids are joined via...? A condensation reaction in which a peptide bond is formed and a water molecule eliminated 25 of 42 A chiral carbon A carbon atom attached to four different atoms/groups or atoms 26 of 42 Optical isomers Stereoisomers that are non-superimposable images of each other 27 of 42 A polyester is formed from....? A dicarboxylic acid and a diol 28 of 42 A polyamine if formed from....? A dicarboxylic acid and a diamine 29 of 42 The reagent to detect carboxylic acids is.....? Aqueous sodium hydroxide to form effervescence if present 30 of 42 The reagent to detect a phenol is.....? Sodium to form effervescene if present or bromine to form a white precipitate if present 31 of 42 The reagent to detect alkenes is.....? Bromine water which will go from orange to colourless if present 32 of 42 The reagent to detect amines is....? Hydrochloric acid which is detected by a fishy smell 33 of 42 In thin layer chromatography the states of the phases are....? Mobile phase : liquid Stationary phase : solid 34 of 42 In gas chromatography the states of the phases are...? Mobile phase: gas Stationary phase: solid or liquid 35 of 42 A solid stationary phase separates by...? Adsorption 36 of 42 A liquid stationary phase separates by....? Relative solubility 37 of 42 To calculate the Rf value: Distance moved by component / Distance moved by solvent front 38 of 42 Retention time The time for a component to pass from the column inlet to the detector 39 of 42 2 types of NMR Carbon-13 NMR and proton NMR 40 of 42 The number of peaks shows...? The number different carbon environments 41 of 42 The chemical shifts show...? The type of carbon environment 42 of 42
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