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

Electron Pair Sharing Reactions (DP IB Chemistry: SL): Exam Questions

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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

Choose your answer

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

Choose your answer

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

Choose your answer

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

Choose your answer

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

Choose your answer

61 mark

Which reaction(s) can alkenes undergo? 

I. Addition

II. Hydration

III. Reduction

  • I and II only

  • I and III only

  • II and III only

  • I, II and III

Choose your answer

11 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

    Choose your answer

    21 mark

    The synthesis of ethyl butanoate can be carried out in three steps:

                                             I                   II                      III

                            C4H9Br   →  C4H9OH  →  C3H7COOH  →  C3H7COOC2H5  

    What is the correct classification of the steps?

     

    I

    II

    III

    A

    substitution

    oxidation

    condensation

    B

    addition

    substitution

    condensation

    C

    oxidation

    substitution

    condensation

    D

    substitution

    oxidation

    substitution

      Choose your answer

      31 mark

      Which compound could be X in this two step reaction pathway?

      C3H8 → X  → C3H7OH

      • C2H5CN

      • C3H7Cl

      • C3H6Cl2

      • C2H5COOH

      Choose your answer

      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

        Choose your answer

        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

          Choose your answer

          31 mark

          Which molecule can react with both sodium borohydride, NaBH4, and warm acidified potassium dichromate(VI)?

          • CH3CHOHCH3

          • CH3C(CH3)2CHO

          • (CH3)3COH

          • CH3C(CH3)2CH2OH

          Choose your answer