Chemistry XII Unit 6 Questions: 50 Time Limit: 50 minutes Passing Score: 60% Start Quiz Chemistry XII Unit 6 Question 1 of 50 What are haloalkanes? Compounds with halogen attached to sp2 carbon Compounds with halogen attached to sp3 carbon of alkyl group Aromatic compounds Pure hydrocarbons What are haloarenes? Compounds with halogen attached to sp3 carbon Compounds with halogen attached to sp2 carbon of aromatic ring Aliphatic compounds Alkenes What is IUPAC name of CH3CH2Cl? Ethyl chloride Chloroethane 1-Chloroethane Ethane chloride What is IUPAC name of CH3CHBrCH3? 2-Bromopropane 1-Bromopropane Isopropyl bromide Propyl bromide What is IUPAC name of CCl4? Carbon chloride Carbontetrachloride Tetrachloromethane Tetrachlorocarbon What is IUPAC name of CHCl3? Trichloromethane Chloroform Methyl trichloride Trichloro methyl What is IUPAC name of CH2Cl2? Methylene chloride Dichloromethane Methyl dichloride Dichloro methyl What is common name of CHI3? Tri-iodomethane Iodoform Iodomethane Methyl iodide What are primary alkyl halides? Halogen attached to 1 degree carbon Halogen attached to 2 degree carbon Halogen attached to 3 degree carbon Halogen attached to aromatic ring What are secondary alkyl halides? Halogen attached to 1 degree carbon Halogen attached to 2 degree carbon bonded to two other carbons Halogen attached to 3 degree carbon Halogen attached to benzene What are tertiary alkyl halides? Halogen attached to 1 degree carbon Halogen attached to 2 degree carbon Halogen attached to 3 degree carbon bonded to three other carbons Halogen attached to ring What are allylic halides? Halogen on sp2 carbon of double bond Halogen on sp3 carbon adjacent to C=C bond Halogen on benzene ring Halogen on sp carbon What are benzylic halides? Halogen on benzene ring directly Halogen on sp3 carbon attached to benzene ring Halogen on alkene Halogen on alkyne What are vinylic halides? Halogen on sp3 carbon Halogen on sp2 carbon of C=C double bond Halogen on aromatic ring Halogen on saturated carbon How is alkyl chloride prepared from alcohol? Alcohol plus HCl with ZnCl2 catalyst Alcohol plus water Alcohol plus air Alcohol plus base What is best reagent to prepare alkyl chloride from alcohol? HCl Thionyl chloride SOCl2 Water Sodium chloride What is product when alcohol reacts with PCl5? Alkyl chloride plus POCl3 plus HCl Alkyl bromide Alkyl iodide No reaction What is product when alcohol reacts with PCl3? Alkyl chloride plus H3PO3 Alkyl bromide plus HBr Alkyl iodide Alcohol remains unchanged What is Swarts reaction? Preparation of alkyl fluorides from alkyl chlorides using AgF or Hg2F2 Preparation of chlorides Preparation of bromides Preparation of iodides What is Finkelstein reaction? Preparation of alkyl iodides from alkyl chlorides or bromides using NaI in acetone Preparation of fluorides Preparation of chlorides only Preparation of alcohol How are aryl halides prepared from benzene? Benzene plus Cl2 in presence of FeCl3 catalyst Benzene plus water Benzene plus alcohol Benzene plus oxygen What is Sandmeyer reaction? Conversion of diazonium salt to aryl halide using CuCl or CuBr Conversion of alcohol to halide Conversion of alkene to halide Conversion of benzene to halide How is aryl iodide prepared from diazonium salt? Using KI without copper salt Using CuI Using AgI Using NaI in acetone What is boiling point order for alkyl halides with same alkyl group? RI > RBr > RCl > RF RF > RCl > RBr > RI RCl > RBr > RI > RF All same Why do boiling points of alkyl halides decrease with branching? Increase in surface area Decrease in surface area and van der Waals forces Increase in molecular weight Increase in polarity What is nature of C-X bond in alkyl halides? Non-polar Polar with carbon having partial positive charge Ionic Polar with carbon having partial negative charge What is bond length order for C-X bonds? C-F < C-Cl < C-Br < C-I C-I < C-Br < C-Cl < C-F C-Cl < C-F < C-Br < C-I All equal What is bond strength order for C-X bonds? C-F > C-Cl > C-Br > C-I C-I > C-Br > C-Cl > C-F C-Cl > C-Br > C-I > C-F All equal What is SN2 reaction mechanism? One step mechanism with inversion of configuration Two step mechanism with carbocation Three step mechanism No mechanism What is rate law for SN2 reaction? Rate equals k [RX] Rate equals k [RX] [Nu] Rate equals k [Nu] Rate is constant What is reactivity order for alkyl halides in SN2 reaction? Primary > Secondary > Tertiary Tertiary > Secondary > Primary Secondary > Primary > Tertiary All equal What is SN1 reaction mechanism? One step mechanism Two step mechanism with carbocation intermediate formation Three step mechanism No mechanism What is rate law for SN1 reaction? Rate equals k [RX] [Nu] Rate equals k [RX] Rate equals k [Nu] Rate equals constant What is reactivity order for alkyl halides in SN1 reaction? Primary > Secondary > Tertiary Tertiary > Secondary > Primary Secondary > Primary > Tertiary All equal What happens to configuration in SN2 reaction? Retention Inversion Racemization No change What happens to configuration in SN1 reaction? Retention only Inversion only Racemization giving 50:50 mixture of both forms Complete inversion What is product when alkyl halide reacts with alcoholic KOH? Alkene by elimination Alcohol by substitution Ether Alkane What is Saytzeff rule? Preferred alkene has more alkyl groups on double bond carbons Preferred alkene has less alkyl groups Random product No preference What is product when alkyl halide reacts with aqueous KOH? Alkene Alcohol by nucleophilic substitution Ether Alkane What is Wurtz reaction? RX plus Na in ether gives alkane R-R RX plus water gives alcohol RX plus base gives alkene RX plus acid gives alkane What is Grignard reagent? RMgX prepared from RX and Mg in dry ether RNa RLi RCu Why are aryl halides less reactive than alkyl halides in nucleophilic substitution? Resonance stabilization of C-X bond Steric hindrance High electronegativity Low molecular weight What happens when chlorobenzene is heated with NaOH at 623K and 300 atm? Phenol is formed No reaction Benzene formed Toluene formed What increases reactivity of aryl halides in nucleophilic substitution? Electron withdrawing groups at ortho and para positions Electron donating groups Alkyl groups No groups What is Fittig reaction? Aryl halide plus Na in ether gives biaryl Alkyl halide reaction Mixed reaction No reaction What is Wurtz-Fittig reaction? RX plus Ar-X plus Na gives R-Ar RX plus RX gives R-R Ar-X plus Ar-X gives Ar-Ar No reaction What is use of CHCl3 (chloroform)? Solvent and for making refrigerant R-22 Only solvent Only anesthetic Only antiseptic What is use of CHI3 (iodoform)? Antiseptic due to liberation of free iodine Solvent Refrigerant Fire extinguisher What is use of CCl4 (carbon tetrachloride)? Fire extinguisher and refrigerant production Only solvent Only antiseptic Only fuel What are CFCs or freons? Chlorofluorocarbons like CCl2F2 used as refrigerants Only chlorides Only fluorides Hydrocarbons Previous Next Submit Quiz Want to save your progress? Create an account or log in to track your quiz scores! Register/Login