Revision NotesExam QuestionsFlashcardsPast PapersMock Exams
IBChemistryDPHLExam QuestionsWhat are the Mechanisms of Chemical Change?Electron Pair Sharing Reactions

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

4 hours62 questions

Select a download format for Electron Pair Sharing Reactions

Scroll for more

Select an answer set to view for
Electron Pair Sharing Reactions

Easy
Medium
Hard
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 species can not act as a ligand?

  • H2O

  • NH4+

  • Cl-

  • OH-

Choose your answer

7
Sme Calculator1 mark

Which definition of a Lewis acid is correct?

  • Electron pair donor

  • Electron pair acceptor

  • Proton donor

  • Proton acceptor

Choose your answer

8
Sme Calculator1 mark

Which of the following best describes ammonia, NH3 , in the following equation?

BF3 + NH3 → BF3NH3

  • Lewis acid 

  • Lewis base

  • Coordinate bond

  • Brønsted-Lowry acid 

Choose your answer

91 mark

Which factors affect the rate of nucleophilic substitution in halogenoalkanes?

I. The nature of the attacking nucleophile

II. The structure of the halogenoalkane

III. The identity of the halogen

  •  I and II only

  •  I and III only

  • II and III only

  • I, II and III

Choose your answer

101 mark

Which halogenoalkane reacts fastest with sodium hydroxide?

  • 1-iodobutane

  • 1-chlorobutane

  • 1-bromobutane

  • 1-fluorobutane

Choose your answer

111 mark

Which reagents are needed to convert nitrobenzene to phenylamine in 2 steps?

 

Step 1

Step 2

A.

tin and concentrated hydrochloric acid

sodium hydroxide

B.

tin and sodium hydroxide

concentrated hydrochloric acid

C.

concentrated hydrochloric acid

tin and sodium hydroxide

D.

sodium hydroxide

tin and concentrated hydrochloric acid

    Choose your answer

    121 mark

    Which of the following is true about the structure of benzene?

    I. Benzene has a delocalised structure of π bonds around its ring

    II. Each carbon to carbon bond has a bond order of 1.5

    III. Benzene is susceptible to attack by nucleophiles

    • I and II only

    • I and III only

    • II and III only

    • I, II and III

    Choose your answer

    13
    Sme Calculator    1 mark

    4-nitrophenol can be produced from phenol.

    20-2-fromiing-4-nitrophenol

    What is the name of the mechanism used to make 4-nitrophenol? 

    • Nucleophilic substitution

    • Nucleophilic addition

    • Electrophilic addition

    • Electrophilic substitution

    Choose your answer

    141 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

    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

      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

        Choose your answer

        31 mark

        In which complexes does iron have an oxidation state of +3? 

        I.   [Fe(H2O)6]3+

        II.  [Fe(H2O)5(CN)]2+

        III. [Fe(CN)6]3−

        • I and II only

        • I and III only

        • II and III only

        • I, II and III

        Choose your answer

        41 mark

        Ammonia is a stronger ligand than water. Which statement is correct when concentrated aqueous ammonia solution is added to dilute aqueous copper(II) sulfate solution?

        • The d-orbitals in the copper ion split.

        • There is a smaller splitting of the d-orbitals.

        • Ammonia replaces water as a ligand.

        • The colour of the solution fades.

        Choose your answer

        51 mark

        Cobalt forms the complex [Co(NH3)5Cl]2+. Which statements are correct for this complex? 

        I. The cobalt ion acts as a Lewis acid.

        II. The cobalt ion has an oxidation state of +2.

        III. There are 90° bond angles between the cobalt ion and the ligands.

        • I and II only 

        • I and III only

        • II and III only

        • I, II and III

        Choose your answer

        61 mark

        Which of the following statements is not correct?

        • A Brønsted-Lowry base is a proton acceptor

        • Ammonia can act as a Brønsted-Lowry base and Lewis base

        • A Lewis acid is an electron pair acceptor 

        • A hydroxide ion can only act as a Lewis base

        Choose your answer

        71 mark

        Which compound will react most readily by an SN2 mechanism?

        • (CH3)3CBr

        • CH3CH2CH2CH2Cl

        • CH3CH2CH2CH2Br

        • (CH3)3CCl

        Choose your answer

        81 mark

        An alkene, X, undergoes electrophilic addition with hydrogen bromide to form a halogenoalkane, Y, as the minor product. 

        The halogenoalkane, Y , can react with sodium hydroxide in aqueous conditions to form butan-1-ol. 

        What is the correct identity of the alkene, X? 

        • 2-methylpropene

        • But-1-ene

        • But-2-ene 

        • Pent-1-ene

        Choose your answer

        91 mark

        Benzene can undergo nitration to form nitrobenzene. Which of the following statements is not correct?

        • Concentrated nitric acid acts as a base 

        • A nitronium ion acts as an electrophile 

        • HSO4- is produced in the formation of the electrophile 

        • Aluminum chloride is required as a catalyst for the reaction 

        Choose your answer

        101 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

          111 mark

          Which of the following reactions produces only pentan-2-ol?

          • Water and pent-1-ene

          • 1-bromopentane and ethanolic NaOH

          • Water and pent-2-ene

          • 2-bromopentane and ethanolic NaOH

          Choose your answer

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

              • (CH3)2CHCH2CH2OH

              • CH3CH(OH)CH2CH2CH2CH3

              • CH3CH2CH2CH2CH2OH

              • CH3CH2CH2CH(OH)CH3

              Choose your answer

              4
              Sme Calculator              1 mark

              Copper forms the complex [CuCl4]2-. Which statements are correct for this complex?

              I. The complex has a tetrahedral shape

              II. The copper ion has a charge of +2

              III. The copper ion acts as a Lewis base

              • I and II only

              • I and III only

              • II and III only

              • I, II and III

              Choose your answer

              5
              Sme Calculator              1 mark

              Consider the following equation

              AgCl + 2NH3→ [Ag(NH3)2]+ + Cl-

              Which of the following statements is correct?

              • Silver is acting as a Lewis base

              • AgCl is acting a Lewis base

              • NH3 is acting as a Brønsted-Lowry base

              • Silver ions are acting as a Lewis acid

              Choose your answer

              6
              Sme Calculator              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

              7
              Sme Calculator              1 mark

              But-1-ene is reacted first with hydrogen chloride to produce X, which is then reacted with aqueous sodium hydroxide to give Y.

              Finally, Y is reacted with excess acidified potassium dichromate solution.

              CH subscript 2 CHCH subscript 2 CH subscript 3 rightwards arrow with HCl on top straight X rightwards arrow with NaOH left parenthesis aq right parenthesis on top straight Y rightwards arrow with straight H to the power of plus divided by Cr subscript 2 straight O subscript 7 to the power of 2 minus end exponent left parenthesis aq right parenthesis on top straight Z

              What is the major product, Z? 

              • CH3(CH2)2CH2OH

              • CH3COCH2CH3

              • CHOCH2CH2CH3

              • CH3(CH2)3COOH

              Choose your answer

              8
              Sme Calculator              1 mark

              Which halogenoalkane will react fastest with a 0.1 mol dm-3 solution of aqueous sodium hydroxide?

              • 2-bromo-2-methylpropane

              • 2-iodo-2-methylpropane

              • 1-bromobutane

              • 1-iodobutane

              Choose your answer

              9
              Sme Calculator              1 mark

              Which statement is correct about the major reaction between 1-bromobutane, CH3CH2CH2CH2Br, and dilute sodium hydroxide solution, NaOH (aq)?

              • The rate equation is second order.

              • The hydroxide ion acts as a Brønsted–Lowry acid.

              • The reaction has two distinct steps.

              • Water is a product.

              Choose your answer

              10
              Sme Calculator              1 mark

              Which of the following would not be a product of the reaction of pent-1-ene with HCl?

              • CH2ClCHClCH2CH2CH3

              • CHClCH2CH2CH2CH3

              • CH3CH2CHClCH2CH3

              • CH3(CH2)2CHClCH3

              Choose your answer

              11
              Sme Calculator              1 mark

              But-1-ene reacts separately with HBr and H2/ Ni to give products X and Z respectively. 

              What are the major products of the reactions?

               

              X

              Z

              A.

              CH2BrCH2CH2CH3

              CH3CH2Cidentical toCH

              B.

              CH3CH2CH2CH2OH

              CH3CH2CH2CH3

              C.

              CH3CHBrCH2CH3

              CH3CH2Cidentical toCH

              D.

              CH3CHBrCH2CH3

              CH3CH2CH2CH3

                Choose your answer