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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1
1 mark

Which of these compounds would act as a nucleophile?

  • C2H6

  • H+

  • OH-

  • Al

Choose your answer

2
1 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

3
1 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

4
1 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

5
1 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

6
1 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

1
1 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

    2
    1 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

      3
      1 mark

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

      C3H8 → X  → C3H7OH

      • C2H5CN

      • C3H7Cl

      • C3H6Cl2

      • C2H5COOH

      Choose your answer

      4
      1 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

        Choose your answer

        1
        1 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

          2
          1 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

            3
            1 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