OCR Module 6 Welcome to your OCR Module 6 Which of the following is correct about phenol?I. It acts like an alcoholII. It is acidicIII. The O-H bond is weaker than the C-O bond II and III only I and III only I only II only What is the shape of a benzene molecule? Planar Trigonal planar Pyramidal Bent By what mechanism is benzene converted to nitrobenzene? Electrophilic substitution Nucleophilic substitution Electrophilic elimination Nucleophilic elimination Which of the following causes the formation of a silver mirror when Tollens' reagent is added to it? Butanal Butanone Butanoic acid Butene What is the product when sodium tetrahydridoborate is added to propanone in aqueous ethanol? Propan-2-ol Propan-1-ol Propanoic acid Propanal What is observed when propanal reacts with 2,4-Dinitrophenylhydrazine? Orange precipitate Red preciitate Silver mirror No reaction Which of the following statements are true?I. Methanoic acid can be oxidisedII. Alcohols react with acid anhydrides to form estersIII. Carboxylic acids do not form salts on reaction with bases I and II only I and III only I only II only Which of the following is the correct order starting from weakest acid to strongest acid? Butanoic acid, propanoic acid, 2-chloropropanoic acid 2-chloropropanoic acid, propanoic acid, butanoic acid Butanoic acid, 2-chloropropanoic acid, propanoic acid Propanoic acid, 2-chloropropanoic acid, butanoic acid Pentanoic acid reacts with propan-1-ol in the presence of acid to form? Propylpentanoate Pentylpropanoate Propylpentanone Propylpentanal Which of the following is the strongest base? Secondary amine Primary amine Tertiary amine Phenylamine Excess ammonia dissolved in ethanol is reacted with halogenoalkane. What is most likely to be the end product of the reaction that is present in excess? Primary amine Quaternary ammonium salt Secondary amine Tertiary amine Methylammonium chloride is reacted with sodium hydroxide. What is the product of the reaction? Methylamine Methylamide Acid anhydride No reaction An amino acid with a carboxylic group on the R chain will most likely have an isoelectric point at? pH<3 pH<7 pH=7 pH>10 Which of the following statements is true? Optical isomerism is a type of stereoisomerism Chiral carbon is symmetric Optical isomers have the same physical properties but different chemical properties In optical isomerism, a molecule can have 2 or more optical isomers What is the product of hydrolysis of proteins? Amino acids Acid anhydrides Aldehydes Glucose Which of the following is a polyester? Terylene Kevlar Nylon Polyethene Which of the following statements is correct?I. Polyamide is biodegradableII. Poly(ethene) is biodegradableIII. Polyester is a condensation polymer II and III only III only II only I only Which of the following statements is incorrect? Polyesters have higher melting points than polyamides Polyethene is an addition polymer Kevlar is a polyamide Condensation polymers can be hydrolysed What is the functional group change in Friedel-Crafts Acylation? Benzene to phenyl ketone Benzene to alkyl benzene Benzene to nitrobenzene Benzene to phenol What is the mechanism of the reaction by which halogenoalkanes are converted to nitriles by KCN? Nucleophilic substitution Electrophilic substitution Nucleophilic addition Electrophilic addition What is the mechanism of Friedel-Crafts alkylation? Electrophilic substitution Nucleophilic substitution Nucleophilic addition Electrophilic addition What is the product of oxidation of aldehydes? Carboxylic acid Alcohol They cannot be oxidised Ketones What is the product of a reaction between acylchloride and alcohol? Ester Carboxylic acid Acid anhydride Amide How is the melting point of a sample affected by the impurities? The sample melts over a range of temperature The melting point increases The melting point is not affected The melting and boiling points become the same What is the state of the stationary phase in Thin-layer Chromatography? Solid Liquid Gas Either gas or liquid Substances in Gas-Liquid Chromatography are identified by? Retention rate Colour Ionic density Electron flow Which of the following reagents is best used to test for the presence of the haloalkane functional group? Aqueous silver nitrate in ethanol Bromine water 2,4-DNP Potassium dichromate How many peaks of C-13 NMR are there for 2-methylbutane? 4 3 2 5 Which of the following is true about tetramethylsilane?I. It is non-toxicII. It shows one peak on H-NMRIII. It has a low boining point I, II and III I and II only I and III only I only How many equivalent H atoms are there in 2-bromobutane with reference to H-NMR? 4 3 2 1 Time is Up!