Tiêu đề 10.HALOALKANES AND HALOARENES - Questions.pdf ✅

10.HALOALKANES AND HALOARENES (1.)Tertiary alkyl halides are practically inert to substitution by SN2 mechanism because of (a.) Steric hindrance (b.) Inductive effect (c.) Instability (d.) Insolubility (2.)Reaction of t-butyl bromide with sodium methoxide produces (a.) Isobutane (b.) Isobutylene (c.) Sodium t-butoxide (d.) t-butylmethyl ether (3.)Which of the following will not give iodoform test? (a.) Isopropyl alcohol (b.) Ethanol (c.) Ethanal (d.) Benzyl alcohol (4.)In the reaction sequence, C2H5Cl + KCN C2H5OH → X H3O⨁ → △ Y What is the molecular formula of Y? (a.) C3H6O2 (b. ) C3H5N (c.) C2H4O2 (d. ) C2H6O (5.)The structure of the major product formed in the following reaction is (a.) (b.) (c.) (d.) (6.)In the chemical reactions, The compounds ‘A’ and ‘B’ respectively are (a.) Nitrobenzene and fluorobenzene (b.) Phenol and benzene (c.) Benzene diazonium chloride and fluorobenzene (d.) Nitrobenzene and chlorobenzene (7.)Which one of the following chlorohydrocarbons readily undergoes solvolysis? (a.) CH2 = CHCl (b.) (c.) (d.) (8.)Chlorination of toluene in presence of light and heat followed by treatment with aqueous NaOH gives (a.) o-cresol (b.) p-cresol (c.) mixture of o-cresol and p-cresol (d.) 1, 3, 5-trihydroxy toluene (9.)The reaction of toluene with Cl2 in presence of FeCl3 gives predominantly (a.) Benzoyl chloride (b.) Benzyl chloride (c.) o-and p-chlorotoluene (d.) m-chlorotoluene (10.)Chlorobenzene gives aniline with (a.) NH3/Cu20 (b. ) NH3/H2SO4 (c.) NaNH2 (d. ) None of the above (11.)Which one of the isomers of cyclohexane hexachloride is strong pesticide? (a.) α (b.) β (c.) γ (d.) δ
(12.)Ethyl ortho formate is formed by heating ............ with sodium ethoxide. (a.) CHCl3 (b. ) C2H5OH (c.) HCOOH (d.) CH3CHO (13.)Best method of preparing alkyl chloride is (a.) ROH + SOCl2 ⟶ (b. ) ROH + PCl5 ⟶ (c.) ROH + PCl3 ⟶ (d. ) ROH + HCl Anhy.ZnCl2 → (14.)Which of the following will not respond to iodoform test? (a.) Ethyl alcohol (b.) Propanol-2 (c.) Propanol-1 (d.) Ethanal (15.)Maximum number of molecules of CH3I that can react with a molecule of CH3NH2 are (a.) 3 (b.) 4 (c.) 2 (d.) 1 (16.)Which of the compounds when brominated turns to meso 2, 3-dibromobutane? (a.) Cis-2-butene (b.) Iso-butane (c.) Butane (d.) Trans-2-butene (17.)Which of the following statements about benzyl chloride is incorrect? (a.) It is less reactive than alkyl halides (b.) It can be oxidised to benzaldehyde by boiling with copper nitrate solution (c.) It is a lachrymatory liquid and answers Beilstein’s test (d.) It gives a white precipitate with alcoholic silver nitrate (18.)The reaction in which phenol differs from alcohol is (a.) It undergoes esterification with carboxylic acid (b.) It reacts with ammonia (c.) It forms yellow crystals of iodoform (d.) It liberates H2 with Na metal (19.)In the reaction, 2A + dry oxide ∆ → ether + 2AgX A is a/an (a.) Primary alcohol (b.) Acid (c.) Alkyl halide (d.) Alcohol (20.)The alkyl halides that can be made by free radical halogenation of alkanes are (a.) RCl and RBr but not RF or RI (b.) RF,RCl and RBr but not RI (c.) RF, RCl, RBr, RI (d.) RF, RCI and RI but not RBr (21.)X compound reacts with Na to give CH3 CH2 CH2 CH3 , then compound X is (a.) CH3 CH2OH (b. ) CH3 CH2 − Cl (c.) CH3 − CH3 (d. ) CH3CH2CH2CH2 OH (22.)p-nitrobromobenzene can be converted to p- nitroaniline by using NaNH2. The reaction proceeds through the intermediate named (a.) Carbocation (b.) Carbanion (c.) Benzyne (d.) Dianion (23.)Elimination of bromine from 2-bromobutane results in the formation of (a.) Predominantly 2-butyne (b.) Predominantly 1-butene (c.) Predominantly 2-butene (d.) Equimolar mixture of 1 and 2-butene (24.)What happens if CCl4 is treated with AgNO3? (a.) A white ppt. of AgCl will form (b.) NO2 will be evolved (c.) CCl4 will dissolve in AgNO3 (d.) Nothing will happen (25.)The organic chloro compound, which shows complete stereochemical inversion during an SN2 reaction is (a.) (C2H5 )2 CHCl (b. ) (CH3 )3CCl (c.) (CH3 )2 CHCl (d. ) CH3Cl (26.)Identify X and Y in the following sequence C2H5Br X → product Y → C3H7NH2 (a.) X = KCN, Y = LiAlH4 (b. ) X = KCN, Y = H3O + (c.) X = CH3 Cl, Y = AlCl3/HCl (d. ) X = CH3 NH2, Y = HNO2 (27.)1-chlorobutane on reaction with alcoholic potash gives (a.) but-1-ene (b.) butan-1-ol (c.) but-2-ene (d.) butan-2-ol (28.)Which of the following applies in the reaction, CH3CHBrCH2CH3 Alc.KOH → (i)CH3CH = CHCH3 (major product) (ii) CH2 = CHCH2CH3 (minor product) (a.) Markownikoff’s rule (b.) Saytzeff’s rule
(c.) Kharasch effect (d.) Hofmann’s rule (29.)CH3Br + KCN(alc. ) → X Reduction → Na+C2H5OH Y What is Y in the series? (a.) CH3CN (b. ) C2H5CN (c.) C2H5NH2 (d. ) CH3NH2 (30.)Which of the following does not answer iodoform test? (a.) n-butyl alcohol (b.) Acetophenone (c.) Acetaldehyde (d.) Ethylmethyl ketone (31.)Number of monochloro derivatives obtained when neo −pentane is chlorinated, is (a.) One (b.) Two (c.) Three (d.) Four (32.)Which one of the following does not give iodoform? (a.) (b.) CH3OH (c.) CH3 CH2OH (d. ) (33.)t-butyl chloride preferably undergo hydrolysis by (a.) SN1 mechanism (b.) SN2 mechanism (c.) Any of (a) and (b) (d.) None of the above (34.)How many structures of F is possible? (a.) 2 (b.) 5 (c.) 6 (d.) 3 (35.)Reaction of alkyl halides with aromatic compounds in presence of anhy. AlCl3 is known as (a.) Friedel-Craft’s reaction (b.) Hofmann degradation (c.) Kolbe’s synthesis (d.) Beckmann rearrangement (36.)Identify A and B in the following reaction C2H5Cl A → C2H5OH B ← C2H5Cl (a.) A= aqueous KOH; B= AgOH (b.) A= alcoholic KOH/ ∆; B=aqueous NaOH (c.) A= aqueous NaOH; B= AgNO2 (d.) A = AgNO2; B = KNO2 (37.)The catalyst used in the preparation of an alkyl chloride by the action of dry HCl on an alcohol is (a.) anhy. AlCl3 (b. ) FeCl3 (c.) anhy. ZnCl2 (d. ) Cu (38.)When CHCl3 is boiled with NaOH, it gives (a.) Formic acid (b.) Trihydroxy methane (c.) Acetylene (d.) Sodium formate (39.)The order of reactivities of methyl halides in the formation of Grignard reagent is (a.) CH3I > CH3Br > CH3Cl (b. ) CH3Cl > CH3Br > CH3I (c.) CH3Br > CH3Cl > CH3I (d. ) CH3Br > CH3I > CH3Cl (40.)Iodoform test is not given by (a.) HCHO (b. ) CH3CHO (c.) CH3COCH3 (d. ) C2H5OH (41.)The product of vinyl chloride and HCl is a (a.) gem chloride (b.) Ethylidene chloride (c.) 1, 1 dichloroethane (d.) All of the above are correct (42.)Identify A and B in the following reactions A Aq.NaOH → ∆ C2H5OH AgOH ← B (a.) A = C2H2,B = C2H6 (b. ) A = C2H5Cl, B = C2H4 (c.) A = C2H4,B = C2H5Cl (d. ) A = C2H5Cl, B = C2H5Cl (43.)Which of the following will not form a yellow precipitate on heating with an alkaline solution of iodine? (a.) CH3 CH(OH)CH3 (b. ) CH3 CH2CH(OH)CH3 (c.) CH3OH (d. ) CH3 CH2OH (44.)The best method for the conversion of an alcohol into an alkyl chloride is by treating the alcohol with (a.) PCl3 (b. ) PCl5 (c.) SOCl2in presence of pyridine (d. ) dry HCl in the presence of anhydrous ZnCl2
(45.)Of the isomeric hexanes, the isomers that give the minimum and maximum number of monochloro derivatives are respectively (a.) 3-methylpentane and 2, 3-dimethylbutane (b.) 2, 3-dimethylbutane and n-hexane (c.) 2, 2-dimethylbutane and 2-methylpentane (d.) 2, 3-dimethylbutane and 2-methypentane (46.)A bromoalkane ‘X’ reacts with magnesium in dry ether to form compound ‘Y’. The reaction of ‘Y’ with methanal followed by hydrolysis yield an alcohol having molecular formula C4H10O. The compound ‘X’ is (a.) Bromoethane (b.) Bromomethane (c.) 1-bromopropane (d.) 2-bromopropane (47.)In the reaction, The major product A is (a.) (b.) (c.) (d.) (48.)CH3Br + OH̅ → CH3OH + Br − reaction proceeds by SN2 mechanism. Its rate is dependent on the concentration of (a.) CH3Br,OH̅ (b. ) CH3Br only (c.) OH̅ only (d. ) CH3Br, CH3OH (49.)Alkyl iodide reacts with NaCN to give alkyl cyanide and small amount of alkyl isocyanide. Formation of these two products is due to the (a.) ionic character of NaCN (b.) nucleophilic character of CN − (c.) ambidentate character of CN − (d.) Electrophilic character of CN − (50.)Ethyl chloride on heating with AgCN forms a compound X. The functional isomer of X is (a.) C2H5NC (b. ) C2H5NH2 (c.) C2H5CN (d. ) None of these (51.)Which one of the following compound reacts with chlorobenzene to produce DDT? (a.) Acetaldehyde (b.) Nitrobenzene (c.) m-chloroacetaldehyde (d.) Trichloroacetaldehyde (52.)Grignard reagent is not prepared in aqueous medium but prepared in either medium, because (a.) the reagent is highly reactive in ether (b.) the reagent does not react with water (c.) the reagent becomes inactive in water (d.) the reagent reacts with water (53.)Which of the following does not answer iodoform test? (a.) N-butyl alcohol (b.) Sec-butyl alcohol (c.) Acetophenone (d.) Acetaldehyde (54.)Hexachloroethane is also called (a.) Artificial sweetner (b.) Artificial camphor (c.) Artificial polymer (d.) None of these (55.)Wurtz’s reaction involves the reduction of alkyl halide with (a.) Zn/HCl (b.) HI (c.) Zn/Cu couple (d.) Na in ether (56.)On warming with silver powder, chloroform is converted into (a.) Acetylene (b.) Hexachloroethane (c.) 1, 1, 2, 2-tetrachloroethane (d.) Ethylene (57.)1, 2-dibromo cyclohexane on dehydrogenation gives (a.) (b.)