24. CTN Alkyl and Aryl Halides PDF

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Alkyl and Aryl Halides

Chapter Test Max. Marks: 180

Time: 60 mins

6. Finkelstein reaction is -

1. In reaction ZnX2

C2H5OH + HX → C2H5X + H2O

(a) 2CH3CH2Cl + Ag2O (dry) → CH3CH2OCH2CH3 + 2AgCl

the order of reactivity of HX is -

r

(a) HBr > HI > HCl (c) CH3CH2Br + Ag2O (moist) →

(b) HI > HCl > HBr

CH3CH2OH + AgBr

(c) HCl > HBr > HI

(d) CH3CH2Cl + NaOCH3 →

l 2. Which of the following leads to the formation of an alkyl halide Red P +Br2

→ (a) C2H5OH   

(b) Borodine reaction

KBr Conc.H SO

+ 4 → (c) C2H5OH    2

(c) Borodine - Hunsdiecker reaction

l

(d) Hypobromide reaction

3. Which reaction is termed as Darzen’s Reaction (a) ROH + HCl l2

(a) NaI + C2H5OH

(d) ROH + PCl3

(c) NaBr + CH3COCH3

Br

COBr

(b) NaCl + acetone

9. C2H5Cl + AgF → C2H5F + AgCl The above reaction is called (a) Hunsdiecker (c) Strecker

(b) COOAg

(c)

8. In Finkelstein Reaction, which reactants are used -

(b) ROH + PCl5

4. Silver benzoate reacts with bromine in acetone to form -

(a)

7. The reaction of silver carboxylates with bromine dissolved in carbon tetrachloride is called (a) Hofmann reaction

SOC l (b) C2H5OH 2 →

(

CH3CH2OCH3 + NaCl

(d) Br

5. The reaction of SOCl2 on alkanols to form alkyl chlorides gives good yields because (a) Alkyl chlorides are immiscible with SOCl2 (

(d) Wurtz

10. Which chloride is the most reactive towards aqueous NaOH in ( ) Methyl chloride

(b) Chlorobenzene

(c) Vinyl chloride

(d) Benzyl chloride

11. The SN2 reactivity order for halides :(a) R–F > R–Cl > R–Br > R–I ( ) R–I > R–Br > R–Cl > R–F (c) R–Br > R–l > R–Cl > R–F (d) R–Cl > R–Br > R–F > R–I

(c) Alcohol and SOCl2 are soluble in water (d) The reaction occurs via intermediate formation of an alkyl chloro sulphite

12. Chlorobenzene is (a) More reactive than ethyl bromide (b) More reactive than isopropyl chloride (c) As reactive as methyl chloride

2 Chapter Test 13. Vinylic halides are unreactive towards nucleophilic substitution because of the following except -

21. Action of alcoholic AgNO3 on chlorobenzene is similar to the action on -

(a) C - halogen bond is strong

(a) Allyl chloride

(b) Vinyl chloride

(b) The halogen is bonded to sp2 carbon

(c) Isopropyl chloride

(d) Benzyl chloride

(c) A double bond character is developed in the carbon-halogen bond by reasonance (d) Halide ions are not good leaving groups 14. When an alkyl halide reacts with an alkoxide, the product is(a) Ether

(b) Ester

(c) Hydrocarbon 15. CH3–CH–CH–CH 3

(d) Alcohol SN1 /C2 H5 ONa Williamson Reaction

Ether (Major)

CH3 Br Ether is OC2 H5

(a) CH3–C–CH2 –CH3 CH3

(c) Both correct

22. The number of steps involved in Sn1 and Sn2 mechanisms are given by the set (a) 1, 2

(b) 1, 3

(c) 2, 1

(d) 2, 2

23. Tertiary butyl halide on boiling with water gives tertiary butyl alcohol. The reaction follows (b) SnI mechanism

(a) SE mechanism (c)

Sn2

(d) E1 mechanism

mechanism

24. Inversion of configuration of the product alcohol during the hydrolysis of an optically active halide is an experimental evidence for(b) CH3–CH–CH–CH 3

(a) Sn2 mechanism

(b) Sni mechanism

CH3 OC2H5 (d) None is correct

(c) Sn1 mechanism

(d) A carbanion

(O)

Cl2  CH CHO,  (b) aq .KOH  → (c) → 16. (a) → 3

Identify A, B & C -

25. An alkyl isocyanide is prepared by (a) Heating an amide with P2O5 (b) Reacting an alcohol with NH3

(a) Ethylalcohol Ethyl chloride & Ethane

(c) The action of AgCN on alkyl halide

(b) Ethane, Ethylchloride & CH3–CH2–OH

(d) The action of KCN on alkyl halide

(c) Propane, Propylchloride & CH3–CH2–CH2–OH (d) All the above 17. An alkyl halide reacted with a metal cyanide to give an alkanenitrile. The metal cyanide is -

+

Ag CN H O 26. CH3Br → A 2 → B, [B] is -

(a) CH3 NH2

(b) (CH3) NH

(c) C2H5 NH2

(d) CH3 COOH

27. Reaction of ethyl bromide and silver acetate gives –

(a) AgCN

(b) KCN

(a) Ethyl ethanoate

(c) Cu2(CN)2

(d) Ba(CN)2

(c) Ethanoic anhydride (d) 2-Butanone

18. A strong solution of alcoholic alkali will preferentially promote alkyl halide into an alkene by

(b) Methyl ethanoate

28. A vicinal dihalide is not formed in the reactionPBr

(a) Addition

(b) Elimination

3 → (a) HOCH2–CH2OH 

(c) Polymerisation

(d) Substitution

2 (b) CH3–CH=CH2 →

19. When ethyl bromide is treated with moist Ag2O the product is (a) Ethyl ether

(b) Ethanol

(c) Ethoxy ethane

(d) All of the above

20 A carbon compound A forms B with sodium metal and again A forms C with PCl5 but B and C form diethylether. Therefore A, B & C are (a) C2H5OH, C2H5 ONa, C2H5Cl

Br

HBr → HBr  → (c) HC≡CH  HBr

→ (d) CH3–CH=CHBr  Peroxide

29. 2,2-dichloropropane on hydrolysis yields (a) Acetone

(b) 2,2-Propane diol

(c) Isopropyl alcohol

(d) Acetaldehyde

30. CHCl3 is kept in brown bottles well stoppered and also with 1% alcohol so that it may not form -

(b) C2H5Cl, C2H5 ONa, C2H5 OH

(a) CH2Cl2

(b) COCl2

(c) C2H5OH, C2H6, C2H5Cl

(c) CCl4

(d) None of these

(d) C2H5OH, C2H5 Cl, C2H5ONa

31. Chloroform can be obtained from -

Alkyl and Aryl Halides 40. Pyrene is the commerical name of -

(a) Methanol

(b) Methanal

(a) Degreasing agent CHCl3

(c) Propanol–1

(d) Propanol– 2

(b) Fire extinguisher CCl4

H SO 4 I2 Ag powder (A)  32. CH3–C–CH3 → → (C) → (B) 2  Na CO Hg + + 2

O

3

Product A, B & C are (a) Iodoform, Acetylene & Acetaldehyde (b) Tri. iodomethane, Ethyne & Acetone (c) Iodoform, Ethene & Ethylene glycol (d) Ethene, iodoform & Ethylhydrogen sulphate 33. Which of the following statement is wrong (a) All carbonyl compounds of the general structure CH3–C–R give a positive iodoform test

3

(c) Insecticide CHI3 (d) Aerosol, propellant, C2Cl4F2 41. The yield of alkyl bromide obtained as a result of heating the dry silver salt of carboxyic acid with bromine what will be the order of formation w.r.t. alkyl bromide (a) 1º > 3º > 2º bromides (b) 1º > 2º > 3º bromides (c) 3º > 2º > 1º bromides (d) 3º > 1º > 2º bromides 42. True about alkyl halides is/are -

O

(b) All secondary alcohols give iodoform reaction

(a) Tertiary alkyl halides undergo SN2 substitutions

(c) Alkanols of the structure CH3CH(OH) - R (where R=H, alkyl or aryl) give iodoform reaction.

(b) Alkyl iodides on exposure to sunlight gradually darken (c) Alkyl chlorides do not give beilstein test

(d) The only aldehyde giving iodoform reaction is acetaldehyde.

(d) A nucleophilic substitution is most difficult in alkyl iodides

34. The oxidation of CHCl3 by air & light is prevented by adding (a) CH3COOH

(b) C2H5OH

(c) CH3CHO

(d) CH3COOCH3

35. Isocyanide reaction involves the intermediate formation of (a) : CCl2

(b) CH+3

(c) CH¯3

(d) CCl3·

36. Iodoform test is not given by : (a) C6H5COC6H5

(b) CH3COCH3

(c) CH3CH2COCH3

(d) CH3CH2CHOHCH3

37. The compound with no dipole moment is (a) Methyl chloride

(b) Carbon tetrachloride

(c) Methylene chloride (d) Chloroform 38. The hydrogen atom in chloroform is (a) Acidic

(b) Basic

(c) Neutral

(d) None of these

39. Iodoform gives a precipitate with AgNO3 on heating but chloroform does not because (a) Iodoform is ionic (b) Chloroform is covalent (c) C–I bond in iodoform is weak and C–Cl bond in chloroform is strong (d) None

43. The correct order of density is (a) C2H5I > C2H5Br > C2H5Cl (b) C2H5Cl > C2H5Br > C2H5I (c) C2H5Cl > C2H5I > C2H5CBr (d) None of these 44. Ethyl bromide and isopropyl chloride can be distinguished by (a) Alcoholic AgNO3 (b) Comparing their colours (c) Burning the compounds on spatula (d) Aqueous KOH solution 45. The compound C2H4Cl2 has two isomers and they can be distinguished by the reaction with (a) Aq. KOH

(b) Alc. KOH

(c) Bromine water

(d) NaNH2...