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IBChemistrySLExam QuestionsWhat are the Mechanisms of Chemical Change?Electron Pair Sharing Reactions

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First teaching 2023

First exams 2025

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Electron Pair Sharing Reactions (SL IB Chemistry)

Exam Questions

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Electron Pair Sharing Reactions

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Electron Pair Sharing Reactions

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11 mark

Which of these compounds would act as a nucleophile?

  • C2H6

  • H+

  • OH-

  • Al

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21 mark

Ethene reacts with steam in the presence of sulfuric acid.

C2H4  +  H2O →  CH3CH2OH

What type of reaction is this?

  • acid / base

  • addition

  • hydrolysis

  • substitution

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31 mark

Which reaction is an example of nucleophilic substitution?

  • C6H6 + Br2 → C6H5Br+ HBr

  • CH2=CH2 + HBr → CH3CH2Br

  • C3H7Br + H2O → C3H7OH + HBr

  • C2H6 + Br2 → C2H5Br + HBr

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41 mark

Bromomethane, CH3Br, is used as a fumigant to destroy insect pests in grain that is to be stored. It can be made by reacting methanol with hydrogen bromide.

CH3OH  +  HBr  →  CH3Br  + H2O

What type of reaction is this?

  • condensation

  • electrophilic substitution

  • free radical substitution

  • nucleophilic substitution

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51 mark

What reagents and conditions are needed to convert but-2-ene into butane?

  • Concentrated sulfuric acid, steam, 300oC

  • Hydrogen gas, Ni catalyst, 150oC

  • Acidified potassium dichromate, heating under reflux

  • Hydrogen bromide, room temperature

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61 mark

Which reaction(s) can alkenes undergo? 

  1. Addition
  2. Hydration
  3. Reduction

  • I and II only

  • I and III only

  • II and III only

  • I, II and III

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11 mark

Isomers X and Y both react with HBr.7KgQdxfW_10-2-m-q2-ib-chemistry-mcqs

 A mixture of X and Y is reacted with HBr.

Which three structures represent three different possible products of this reaction?

 A  

(CH3)2CHCBr3

   (CH3)2CBrCHBr2

 CH3CHBrCHBrCH3

B

(CH3)2CHCBr3

(CH3)2CBrCHBr2

CH3CBr2CHBrCH3

C

(CH3)2CBrCBr3

(CH3)2CHCBr3

CH3CBr2CHBrCH3

D

(CH3)2CBrCHBr2

CHBr2CBr(CH3)CH3

CH3CHBrCBr2CH3

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    21 mark

    In the hydrolysis of bromoethane by aqueous sodium hydroxide, what is the nature of the attacking group and of the leaving group?

     

     

    attacking group

    leaving group

    A

    B

    C

    D

    electrophile

    electrophile

    nucleophile

    nucleophile

    electrophile

    nucleophile

    electrophile

    nucleophile

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      11 mark

      Limonene is an oil formed in the peel of citrus fruits.10-2-h-q1-ib-chemistry-mcqs

      Which product is formed when an excess of bromine, Br2(l), reacts with limonene at room temperature in the dark?10-2-h-q1-i-ib-chemistry-mcqs

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        21 mark

        Which compound has an Mr of 84.18 and will react with HBr to give a product with an Mr of 165.09?10-2-h-q3-ib-chemistry-mcqs

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          31 mark

          Which compound is produced in the reaction between pent-2-ene and steam?

          • (CH3)2CHCH2CH2OH

          • CH3CH(OH)CH2CH2CH2CH3

          • CH3CH2CH2CH2CH2OH

          • CH3CH2CH2CH(OH)CH3

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