Chap 10 _2 (2nd year)

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1. should be the products when reactants

1. Which C-X bon has the highest bond energy

1. Which alkyl halides has the highest reactivity ,

1. 2.8 is the electronegativity of________

1. Which one is not a nucleophile?

1. The number of molecules taking part in the

1. During SN2 mechanism,carbon atom changes

1. What will be the order of reaction of a reaction

1. Which one among the following is not a good

1. What is the order of kinetics in the SN1

1. Which alkyl halide out of the following may

1. CH3─X

1. b.     CH3─  C  ─  C ─X

1. c.            CH ─ X

1. d.    CH3─ C─ X

1. In elimination reaction of alkyl halide, which

1. When two moles of ethyl chloride react with

1. Zn-Cu couple and alcohol generate_______

1. When CO2 is made to react with ethyl

1. Grignard reagent is reactive due to ________

1. The presence of halogen atom

1. The presence of magnesium atom

1. The polarity of C-Mg bond

1. All

1. SN2 reaction can be best carried out with____

1. Primary alkyl halide

1. Secondary alkyl halide

1. Tertiary alkyl halide

1. All

1. Elimination bimolecular reactions involve____

1. First order kinetics

1. Second order kinetics

1. Third order kinetics

1. Zero order kinetics

1. For which mechanisms, the first step involved

1. The rate of E1 reaction depends

1. The concentration of substrate

1. The concentration of nucleophile

1. The concentration of substrate as well as nucleophile

1. No dependence

1. Alkyl halides are considered to be very

1. They have an electrophilic carbon

1. They have an electrophilic carbon & a good leaving group

1. They have an electrophilic carbon & a bad leaving group

1. They have a nucleophilic carbon & a good leaving group

1. Which one of the following species in not an

1. Which one of the following reactants will be

1. Which one of the following alcohols will be

1. Which one of the following molecules does not

x


42)        Alkyl halides give reactions

a)     Electrophilic substitution

b)    Nucleophilic substitution

c)     Electrophilic addition

d)    Nucleophilic addition

43)        When Ammonia reacts with excess of alkyl halides gives

a) Primary amine           b) Secondary amine

c) Tertiary amine            d) Mixture of amines

44)        Nucleophilic substitution reactions are represented by

a) E1                            b) SN

c) ROH                         d) RCHO

45)        SN reactions are classified into types

a) 4                               b) 3

c) 2                               d) 1

46)        SN2 reactions occur in

a)     Primary alkyl halide

b)    Secondary alkyl halide

c)     Tertiary alkyl halide

d)    All of these

47)        Which SN reaction occurs in two steps?

a) SN1                          b) SN2

c) Both                         d) None of these

48)        In SN2 reactions, two reactants are involved in the rate determining step while these reactions occur in

a) Two steps                 b) Three steps

c) One step                   d) Four steps

49)        Which one of them is organometallic compound?

a) RMgX                       b) RX

c) ROH                         d) RCHO

50)        When Grignard reagent reacts with formaldehyde to yield

a) CH3OH                      b) C2H5OH

c) CH3COCH3                                 d) C3H8

51)        The chemical reaction in which HX is removed from two adjacent carbon atoms of an organic molecule is called

a)     Dehydrogenation    

b)    Dehydrohalogenation

c)     Dehydration

d)    Dehalogenation

52)        Reaction of RX with Ammonia is called

a)     Wurtz’s reaction      

b)    Frankland’s reaction

c)     Hoffmann’s reaction

d)    Friedal Craft reaction

53)        A nucleophile is a

a) Lewis acid                 b) Lewis base

c) Arrhenius acid           d) Arrhenius base

54)        An electrophile is a

a) Lewis acid                 b) Lewis base

c) Arrhenius acid           d) Arrhenius base

55)        Rate determining steps in SN1 reaction is always the

a) Slow step                  b) Fast step

c) Intermediate              d) None of these

56)        Which one of the organic compound is without oxygen?

a) Ether                         b) Ester

c) Alkyl halides              d) Carboxylic acid

57)        Methyl iodide reacts with silver acetate to yield

a) Methyl acetate           b) Methyl ester

c) Methylol phenol         d) Acetyl halide

58)        Grignard reagent reacts with formaldehyde to form

a) Primary alcohol         b) Tertiary alcohol

c) Acetic acid                d) Ketone

59)        Both methane ethane may be prepared in one step reaction from

a) C2H4                                                    b) CH3l

c) CH3OH                      d) C2H5OH

60)        RMgX reacts with PCl3 giving

a) Methyl phosphate      b)Trimethyl phosphate

c) Dimethyl phosphate   d) None of these

61)        Ethyl iodide on its interaction with silver nitrate to yield

a) Ethyl nitrate               b) Ethyl nitrite

c) Nitro methane            d) None of these

62)        Elimination reactions are the reverse of

a)     Electrophilic substitution reaction

b)    Nucleophilic substitution reaction

c)     Addition reaction

d)    Oxidation reaction

63)        In electron pair donor is a strong base

 then the dominant reactions will be

a)     SN2 and E2 is a side reaction

b)    E2 and SN2 is side reaction

c)     E1 and SN2 is side reaction

d)    All of these

64)        E1 reactions occur in

a) RCH2X                      b) R2CHX

c) R3CX                         d) All of these

65)        The removal of hydrogen from that beta carbon which has fewer H – atoms is called

a) Wurtz’s rule               b) Markownikoff’s rule

c) Saytzeef’s rule           d) Hoffmann’s rule

66)        Which of them is organometallic compound?

a) RMgX                       b) TEL

c) TML                          d) All of these

67)        Formula of Thionyl chloride is _______

            a) SOCl2                        b) ZnCl2

            c) CH3Cl                        d) None

68)        When metallic sodium in ether is heated with

            an alkyl halide, a higher alkane is formed. It is

            called ______

            a) Sulphonation                  b) Wurtz’s reaction

            c) Friedel-Crafts reacton     d) None

69)        Which molecule has a zero dipole moment?

            a) CH3Cl                        b) CCl4

            c) CH2Cl2                       d) CHCl3

70)        Grignard’s reagent reacts with alkyl halide to

            form ________

            a) Alkanes                     b) Alkynes

            c) Alkenes                     d) Alcohols

71)        On passing CO2 through Grignard reagent

            ______ is formed.

            a) Methanoic acid          b) Ethanoic acid

            c) Alkyl sodium halide    d) None of these

72)        The hydrolysis of alkyl halides by heating with

            aqueous alkali is a _______ substitution

            reaction.

            a) Electrophilic              b) Nucleophilic

            c) Both a & b                d) None

73)        Ethyl bromide can be converted into ethyl

            alcohol by heating with,

            a) Aqueous KOH           b) Ethanoic KOH

            c) Moist silver oxide      d) Both a & c

74)        The major product obtained by treating 2 –

            chlorobutane with alcoholic KOH is

            a) 1 – Butyne                 b) 2 – Butyne

            c) 1 – Butene                 d) 2 – Butene

75)        Which of the following is a vic – dihalide?

            a) ClCH2CH2Cl              b) CH3CHCl2

            c) BrCH2CH2CH2Br      d) BrCH2CH2CH2CH2Br

76)        3 – Bromohexane can be converted into

            hexane using

            a) Zn, H+                      b) Cu I

            c) (CH3)2CuLi                 d) Na

77)        SN2 reaction proceeds via the formation of

            a) Carbonation              b) Transition sate

            c) Free radical               d) Carbanion

78)        Which of the following alkyl halide reacts

            fastest with AgNO3?

            a) (CH3)3C – Cl               b) (CH3)2 CH Cl

            c) CH3CH2CH2Cl d) (CH3)2CCH2-Cl