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- 1. Write condensed structural formula for all isomers of compounds that fulfill the following requirements: (a) Alkenes with molecular formula CsH10. (b) Alkynes with molecular formula C4H6. (c) Dienes with molecular formula C4H6. 2. For each of the following, give the order of increasing boiling point: (a) n-Heptane, n-octane and n-hexane. (b) n-Pentane, isopentane and n-hexane. (c) 2-Methylhexane, n-heptane and 3,3-dimethylpentane. 9 3. Isomeric compounds can sometimes be distinguished by observing the number of mono- brominated compounds that each forms. In the following cases decide which isomer is present by the number of compounds that are formed. (a) Compound A forms four monobromo compounds. Is it 2-methylbutane or n-pentane? (b) CompoundB forms four monobromo compounds. Is it 2- methylpentane or 3- methylpentane? (c) Compounds C forms monobromo compound. Is it cyclopentane or one mehtylcyclopentane? 4. A hydrocarbon C5H12 was allowed to react with bromine. Only monobromo…What is a molecule that fits these three criteria: It should have a molar mass between 180 and 280 g/mol, contain a substituted cyclohexane like e. g. 5,6-dihydroxy-bicyclo[2.2.2]octane-2-carboxylic acid methyl ester, and be optically active.29. Identify the types of intermolecular force(s) between molecules of each of the following: (8) H-C-F (a) (b) CН3ОН (c) N2 (d) CoНо HICIH
- Butanal (C4H&O) has eight H atoms. Suppose that any of these H atoms can be replaced by a Cl atom to yield a molecule with the formula C4H¬CIO. (a) Identify two H atoms where this substitution would yield constitutional isomers of C4H7CIO; (b) enantiomers of C4H;CIO; (c) conformers of C4H;CIO. H. H H H нн H Butanal O=UB) For a time the prism formula VI, proposed by Albert Ladenburg of Germany, was considered as a possible structure for benzene, on the grounds that it would yield one monosubstitution product and three isomeric substitution products. (7 Marks) CH--CH CH ČH- -CH CH VI (a) Draw Ladenburg structures of three possible isomeric dibromobenzenes. (b) On the basis of the Korner method of absolute orientation, label each Ladenburg structure in (a) as ortho, meta, or para.(d) yes HO OH HÖ H₂N: (a) (e) No (b) 3 • Identify what type of intermolecular force the following compounds experience. H (f) NO (C) CINH (d) • Does (CH3)2CHCCCH3 show cis/trans isomerism? Explain why or why not. HO OH
- What is the structure of bicyclo[1.1.0]butan-2-amine?1: In the sweetening MEROX process for kerosene the mercaptans are converted into (a) Sulpher (b) Disulphide (c) Hydrogen sulphide (d) None of these 2: Which of the following products contain maximum sulphur? (a) Diesel fuel (b) Fuel oil (c) Jet fuel (d) LPG 3: Which of the following petroleum product has a maximum C/H ratio (by weight)? (a) Light diesel oil (b) Fuel oil (c) Naphtha (d) Heating oil 4: Which of the following hydrocarbon are most desirable in gasoline? (a) Paraffins (b) Isoparaffins (c) Naphthenes (d) Aromatic 5: Octane no. of paraffins: (a) Remain constant with change in the number of carbon atoms (b) Increases with increase in the number of carbon atoms (c)Decreases with increase in the number of carbon atoms (d)None of the above 6: Which of the following hydrocarbons has a maximum octane number? (a) Benzene (b) Cyclohexane (c) Hexane (d) Iso-hexane 7: Which of the following petroleum products has a minimum flashpoint? (a)Gasoline (b) Kerosene (c) Fuel oil (d) Heating…(5) Br CH H20 CH;CH;CH; ( ) ČH,CH3 Br CH;C=CNa ( ).
- 1. Which of the following formulae represent the same compound? (1) CH;CH,CH;CHCH3 (3) CH-CНCH, 1. CH2 (2) CH3 CH3 CHCH;CH2 CH3 CH3 CH;CH3 (4) CH;CHCH,CH,CH3 (5) CH;CH,CHCH;CH3 CH3 CH3 A. (2) and (3) only В. (1), (2) and (4) only С. (1), (4) and (5) only D. (1), (2), (3) and (4) onlyCalculate the enthalpy of formation of propane from:a. Combustion data (ΔHc = –2217 kJ mol–1; ΔHf (CO2) = –393.4 kJ mol–1, ΔHf (H2O) =–285.2 kJ mol–1);b. Bond enthalpies (C–C 348 kJ mol–1; C–H 413 kJ mol–1; H–H 436 kJ mol–1; ΔHvap forcarbon = –717 kJ mol–1).2,3-Dibromoprop-1-ene (C3H4Br2) has four H atoms. Suppose that any of these H atoms can be replaced by a Cl atom to yield a molecule with the formula C3H3Br,Cl. (a) Identify two H atoms where this substitution would yield constitutional isomers of C3H3Br,CI; (b) enantiomers of C3H3Br,Cl; (c) diastereomers of C3H3Br,Cl. H нн H Br Br 2,3-Dibromoprop-1-ene