Title 10. HALOALKANES AND HALOARENES.pdf ✅

PAPER 1 (1.) The reaction conditions leading to the best yield of C H Cl 2 5 are : (1) C H2 6 (excess) 2 uvlight +Cl ⎯⎯⎯⎯⎯→ (2) 2 6 2 Dark C H Cl + ⎯⎯⎯⎯→ (3) C H Cl 2 6 2 + (excess) uv light ⎯⎯⎯⎯⎯→ (4) 2 6 2 UV light C H Cl + ⎯⎯⎯⎯⎯→ (2.) Which of the following organic compounds will give a mixture of 1-chlorobutane and 2-chlorobutane on reaction with HCl : (1) (2) (3) CH CH CH CH 2 2 =−= (4) CH CH CH CH 2 2 3 = − − (3.) Which of the following will give iodoform reaction: (1) Formalin (2) Methanol (3) Acetic acid (4) Ethanol (4.) 3 2 2 2CHCl O 2COCl 2HCl x + → + In the above reaction, X stands for : (1) An oxidant (2) A reductant (3) Light (4) None of these (5.) The bad smelling substance formed by the action of alcoholic caustic potash on chloroform and aniline is : (1) Phenyl isocyanide (2) Nitrobenzene (3) Phenyl cyanide (4) Phenyl isocyanate (6.) On heating CHCl3 with aq. NaOH , the product is : (1) CH COONa 3 (2) HCOONa (3) Sodium oxalate (4) CH OH 3 (7.) When alkyl halide is heated with dry Ag O2 , it produces: (1) Ester (2) Ether (3) Ketone (4) Alcohol. (8.) Freon is used : (1) As local anaesthetic (2) For dissolving impurities in metallurgical process (3) In refrigerator (4) In printing industry (9.) Which of the following is obtained when chloral is boiled with NaOH : (1) CH Cl 3 (2) CHCl3 (3) CCl4 (4) None of these
(10.) R X NaOH ROH NaX − + → + The above reaction is classified as : (1) Nucleophilic substitution (2) Electrophilic substitution (3) Reduction (4) Oxidation (11.) Lucas reagent is : (1) conc HCl and anhydrous ZnCl2 (2) conc HNO3 and anhydrous ZnCl2 (3) conc HCl and hydrous ZnCl2 (4) conc HNO3 and hydrous ZnCl2 (12.) Which chloro derivative of benzene among the following would undergo hydrolysis most readily with aq NaOH to furnish the corresponding hydroxy derivative : (1) (2) (3) (4) (13.) Chlorobenzene reacts with Mg in dry ether to give a compound ( A) which further reacts with ethanol to yield: (1) Phenol (2) Benzene (3) Ethyl benzene (4) Phenyl ether (14.) When chlorine is passed through propene at 500 C , which of the following is formed : (1) PVC (2) Allyl chloride (3) Vinyl chloride (4) 1, 2-dichloro ethane (15.) 2-bromopentane is heated with potassium hydroxide in ethanol. The major product obtained is: (1) 2-ethoxypentane (2) pentene-1 (3) trans-pentene-2 (4) cis-pentene-2 (16.) When phenol is treated with CHCl3 and NaOH , the product formed is : (1) Benzaldehyde (2) Salicylaldehyd e (3) Salicylic acid (4) Benzoic acid (17.) Chloropicrin is obtained by the reaction of : (1) Steam on carbon tetrachloride (2) Nitric acid on chlorobenzene (3) Chlorine on picric acid (4) Nitric acid on chloroform
(18.) Trichloroacetaldehyde, CCl CHO 3 reacts with chlorobenzene in presence of sulphuric acid and produces: (1) (2) (3) (4) (19.) IUPAC name of the compound : (1) 4-Bromo-pent-2-ene (2) 2-Bromo-pent-3-ene (3) 4-Bromopentene (4) 3-Bromopentene (20.) No. of structural isomers of C H Br 5 11 is possible : (1) 4 (2) 5 (3) 8 (4) 3 (21.) Increasing order of boiling point of : i. Bromomethane iii. Chloromethane ii. Bromoform iv. Dibromomethane (1) iii  i  iv  ii (2) i  iii  iv  ii (3) i  iii  ii  iv (4) iii  i  ii  iv (22.) Which of following alkyl halide will undergo 2 SN reaction most easily : (1) CH CH CH CH Br 3 2 2 2 −−−− (2) (3) (4) (23.) When an alkyl halide react with silver nitrite the major product will :
(1) Alkane nitrite (2) Nitro alkane (3) Alkane cyanide (4) Alkane isocyanate (24.) Which of the following have highest melting point: (1) (2) (3) (4) All have same m.p. (25.) In above reaction the attacking species will be : (1) Cl− (2) Cl+ (3) Cl (4) 2 : CH (26.) In the following sequences of reactions; 3 2 2 ( ) Br KOH(alc.) 2 CH CH CH I A (B) NaNH2 (C) ⎯⎯⎯⎯⎯⎯→ ⎯⎯⎯→ − ⎯⎯⎯⎯⎯→ the end product (C) is (1) Alkene (2) Alkanol (3) Alkyne (4) Alkyl amine (27.) Compound A and B are respectively : (1) (2) (3) (4) None