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 Multiple Choice QuestionsMultiple Choice Questions

11.

In the following sequence of reactions,

CH subscript 3 minus Br space rightwards arrow with KCN on top space straight A rightwards arrow with straight H subscript 3 straight O to the power of plus on top straight B space rightwards arrow from ether to LiAlH subscript 4 of space straight C
the end product is (C) is

  • acetone

  • methane

  • acetaldehyde

  • acetaldehyde

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12.

In the following reactions,



the major (A) and (C) are respectively

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13.

Which of the following reaction (s) can be used for the preparation of alkyl halides?


straight I. space CH subscript 3 CH subscript 2 OH space plus space HCl space rightwards arrow with Anh. ZnCl subscript 2 on top

II. space CH subscript 3 CH subscript 2 OH space plus space HCl space rightwards arrow

III. space left parenthesis CH subscript 3 right parenthesis subscript 3 COH space plus space HCl space rightwards arrow

IV. space left parenthesis CH subscript 3 right parenthesis subscript 2 CHOH space plus space HCl space rightwards arrow with anh. space ZnCl subscript 2 on top

  • I, III and IV

  • I and II

  • Only IV

  • Only IV

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14.

In an SN1 reaction on chiral centres, there is 

  • 100% racemisation

  • inversion more than retention leading to partial racemization

  • 100% retention

  • 100% retention

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15.

The order of reactivity of phenyl magnesium bromide (phMgBr) with the following compounds.


  • III > II> I

  • II > I > III

  • I > III > II

  • I > III > II

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16.

The IUPAC name of the following compound

  • trans - 2- chloro - 3 - iodo - 2 - pentene

  • cis - 3- iodo - 4-  chloro - 3- pentene

  • trans - 3- iodo - 4- chloro - 3- pentene

  • trans - 3- iodo - 4- chloro - 3- pentene

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17.

Consider the reactions


space left parenthesis straight i right parenthesis space left parenthesis CH subscript 3 right parenthesis subscript 2 CH minus space CH subscript 2 space minus space CH subscript 2 space Br space rightwards arrow with straight C subscript 2 straight O subscript 5 OH on top space left parenthesis CH subscript 3 right parenthesis subscript 2 CHCH subscript 2 OC subscript 2 straight H subscript 5 space plus space Br to the power of minus

left parenthesis ii right parenthesis space left parenthesis CH subscript 3 right parenthesis subscript 2 CHCH subscript 2 Br rightwards arrow with straight C subscript 2 straight H subscript 5 straight O to the power of minus on top space left parenthesis CH subscript 3 right parenthesis subscript 2 CHCH subscript 2 OC subscript 2 straight H subscript 5 space plus Br to the power of minus

The mechanisms of reactions (i) and (ii) are respectively

  • SN1 and SN2

  • SN1 and SN1

  • SN2 and SN2

  • SN2 and SN2

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18.

In the reaction with HCl, an alkene reacts in accordance with the markownikoff's rule, to give a product 1-chloro -1- methylcyclohexane. The possible alkane is 

  • (a) and (b)

  • (a) and (b)

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19.

2,3 -dimethyl - 2- butene can be prepared by heating which of the following compounds with a strong acid?

  • (CH3)2CH-CH(CH)3-CH=CH2

  • (CH3)3C-CH=CH2

  • (CH3)2C =CH-CH2-CH3

  • (CH3)2C =CH-CH2-CH3

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20.

Which one is most reactive towards SN1 reaction?

  • C6H5CH(C6H5)Br

  • C6H5CH(CH3)Br

  • C6H5C(CH3)(C6H5)Br

  • C6H5C(CH3)(C6H5)Br

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